diff --git a/src/devices/owon.ts b/src/devices/owon.ts
index 54b855dec6682..a2687bb4a696e 100644
--- a/src/devices/owon.ts
+++ b/src/devices/owon.ts
@@ -1,4 +1,5 @@
 import {Zcl} from "zigbee-herdsman";
+import type {ClusterDefinition} from "zigbee-herdsman/dist/zspec/zcl/definition/tstype";
 import * as fz from "../converters/fromZigbee";
 import * as tz from "../converters/toZigbee";
 import * as exposes from "../lib/exposes";
@@ -9,6 +10,99 @@ import type {DefinitionWithExtend, Fz, KeyValue, Tz} from "../lib/types";
 const e = exposes.presets;
 const ea = exposes.access;
 
+interface OwonAcControl {
+    attributes: Record<string, never>;
+    commands: {
+        oneKeyPairingRequest: {oneKeyPairingStart: number}; // 0x00 end, 0x01 start
+        writePairingCode: {pairingCode: number};
+        readPairingCodeRequest: Record<string, never>;
+    };
+    commandResponses: never;
+}
+
+const owonExtendChecks = {
+    parseOneKeyPairingInput: (input: unknown) => {
+        const action = String(input).toLowerCase().trim();
+
+        let startParam: number;
+        if (action === "start" || action === "on" || action === "true") {
+            startParam = 0x01;
+        } else if (action === "end" || action === "off" || action === "false") {
+            startParam = 0x00;
+        } else {
+            throw new Error(`Invalid value for one_key_pairing: expected "start"/"on"/"true" or "end"/"off"/"false", got "${input}"`);
+        }
+
+        return {
+            payload: {
+                oneKeyPairingStart: startParam,
+            },
+        };
+    },
+
+    parsePairingCodeInput: (input: unknown) => {
+        if (input === undefined || input === null) {
+            throw new Error("pairing_code is required");
+        }
+
+        const codeStr = typeof input === "number" ? Math.trunc(input).toString() : String(input).trim();
+
+        if (!/^\d+$/.test(codeStr)) {
+            throw new Error(`Invalid pairing_code "${codeStr}", must be decimal number`);
+        }
+
+        const codeNum = Number(codeStr);
+
+        if (codeNum < 0 || codeNum > 65535) {
+            throw new Error(`Invalid pairing_code "${codeStr}", must be between 0 and 65535`);
+        }
+
+        return {
+            payload: {
+                pairingCode: codeNum,
+            },
+        };
+    },
+};
+
+const OwonClustersDefinition: {[s: string]: ClusterDefinition} = {
+    manuSpecificOwonAc: {
+        ID: 0xffac,
+        manufacturerCode: Zcl.ManufacturerCode.OWON_TECHNOLOGY_INC,
+        attributes: {},
+        commands: {
+            oneKeyPairingRequest: {
+                ID: 0x52,
+                parameters: [
+                    {name: "oneKeyPairingStart", type: Zcl.DataType.UINT8}, // 0x00 end, 0x01 start
+                ],
+            },
+            writePairingCode: {
+                ID: 0x20,
+                parameters: [{name: "pairingCode", type: Zcl.DataType.UINT16}],
+            },
+            readPairingCodeRequest: {
+                ID: 0x00,
+                parameters: [],
+            },
+        },
+        commandsResponse: {
+            oneKeyPairingResponse: {
+                ID: 0x52,
+                parameters: [{name: "receiveStatus", type: Zcl.DataType.UINT8}],
+            },
+            oneKeyPairingResultUpdate: {
+                ID: 0x80,
+                parameters: [],
+            },
+            readPairingCodeResponse: {
+                ID: 0x00,
+                parameters: [{name: "pairingCode", type: Zcl.DataType.UINT16}],
+            },
+        },
+    },
+};
+
 interface OwonFallDetection {
     attributes: {
         status: number;
@@ -185,6 +279,78 @@ const fzLocal = {
             return result;
         },
     } satisfies Fz.Converter<"fallDetectionOwon", OwonFallDetection, ["attributeReport", "readResponse"]>,
+
+    owonAcOneKeyPairingResponse: {
+        cluster: "manuSpecificOwonAc",
+        type: ["commandOneKeyPairingResponse", "commandOneKeyPairingResultUpdate"],
+        convert: (model, msg, publish, options, meta) => {
+            if (msg.meta?.manufacturerCode !== Zcl.ManufacturerCode.OWON_TECHNOLOGY_INC) {
+                return {};
+            }
+
+            const payload: KeyValue = {};
+
+            if (msg.type === "commandOneKeyPairingResponse") {
+                const status = msg.data?.receiveStatus;
+                if (status !== undefined) {
+                    payload.one_key_pairing_status = status === 0x00 ? "SUCCESS" : "FAILURE";
+                }
+            }
+
+            if (msg.type === "commandOneKeyPairingResultUpdate") {
+                let buffer: Buffer | undefined;
+
+                if (Buffer.isBuffer(msg.meta?.rawData)) {
+                    buffer = msg.meta.rawData;
+                }
+
+                if (!buffer || buffer.length < 6) {
+                    payload.one_key_pairing_result = {
+                        count: 0,
+                        codes_found: [],
+                    };
+                    return payload;
+                }
+
+                const payloadOffset = 5;
+                const count = buffer.readUInt8(payloadOffset);
+                const codes: number[] = [];
+
+                let offset = payloadOffset + 1;
+                for (let i = 0; i < count; i++) {
+                    if (offset + 1 >= buffer.length) break;
+                    codes.push(buffer.readUInt16LE(offset));
+                    offset += 2;
+                }
+
+                payload.one_key_pairing_result = {
+                    count,
+                    codes_found: codes,
+                };
+            }
+
+            return payload;
+        },
+        // biome-ignore lint/suspicious/noExplicitAny: third-party converter signature requires any
+    } satisfies Fz.Converter<"manuSpecificOwonAc", undefined, any>,
+
+    owonAcReadPairingCodeResponse: {
+        cluster: "manuSpecificOwonAc",
+        type: ["commandReadPairingCodeResponse"],
+        convert: (model, msg, publish, options, meta) => {
+            if (msg.data?.pairingCode !== undefined) {
+                const code = msg.data.pairingCode;
+                const displayCode = code === 0xffff ? null : code;
+
+                return {
+                    pairing_code_current: displayCode,
+                };
+            }
+
+            return {};
+        },
+        // biome-ignore lint/suspicious/noExplicitAny: third-party converter signature requires any
+    } satisfies Fz.Converter<"manuSpecificOwonAc", undefined, any>,
 };
 
 const tzLocal = {
@@ -242,6 +408,50 @@ const tzLocal = {
             );
         },
     } satisfies Tz.Converter,
+
+    owonAcOneKeyPairing: {
+        key: ["one_key_pairing"],
+        convertSet: async (entity, key, value, meta) => {
+            meta.state.one_key_pairing_status = null;
+            meta.state.one_key_pairing_result = null;
+            const commandWrapper = owonExtendChecks.parseOneKeyPairingInput(value);
+
+            await entity.command<"manuSpecificOwonAc", "oneKeyPairingRequest", OwonAcControl>(
+                "manuSpecificOwonAc",
+                "oneKeyPairingRequest",
+                commandWrapper.payload,
+                {disableDefaultResponse: true},
+            );
+        },
+    } satisfies Tz.Converter,
+
+    owonAcWritePairingCode: {
+        key: ["pairing_code"],
+        convertSet: async (entity, key, value, meta) => {
+            const commandWrapper = owonExtendChecks.parsePairingCodeInput(value);
+
+            meta.state.pairing_code = String(value);
+
+            await entity.command<"manuSpecificOwonAc", "writePairingCode", OwonAcControl>(
+                "manuSpecificOwonAc",
+                "writePairingCode",
+                commandWrapper.payload,
+                {disableDefaultResponse: true},
+            );
+        },
+    } satisfies Tz.Converter,
+
+    owonAcReadPairingCode: {
+        key: ["pairing_code_current"],
+        convertGet: async (entity, key, meta) => {
+            await entity.command<"manuSpecificOwonAc", "readPairingCodeRequest", OwonAcControl>(
+                "manuSpecificOwonAc",
+                "readPairingCodeRequest",
+                {},
+                {disableDefaultResponse: true},
+            );
+        },
+    } satisfies Tz.Converter,
 };
 
 export const definitions: DefinitionWithExtend[] = [
@@ -250,7 +460,14 @@ export const definitions: DefinitionWithExtend[] = [
         model: "WSP402",
         vendor: "OWON",
         description: "Smart plug",
-        extend: [m.onOff(), m.electricityMeter({cluster: "metering"})],
+        extend: [
+            m.onOff({powerOnBehavior: false}),
+            m.electricityMeter({
+                cluster: "metering",
+            }),
+
+            m.forcePowerSource({powerSource: "Mains (single phase)"}),
+        ],
     },
     {
         zigbeeModel: ["WSP403-E"],
@@ -258,7 +475,14 @@ export const definitions: DefinitionWithExtend[] = [
         vendor: "OWON",
         whiteLabel: [{vendor: "Oz Smart Things", model: "WSP403"}],
         description: "Smart plug",
-        extend: [m.onOff(), m.electricityMeter({cluster: "metering"}), m.forcePowerSource({powerSource: "Mains (single phase)"})],
+        extend: [
+            m.onOff({powerOnBehavior: false}),
+            m.electricityMeter({
+                cluster: "metering",
+            }),
+
+            m.forcePowerSource({powerSource: "Mains (single phase)"}),
+        ],
     },
     {
         zigbeeModel: ["WSP404"],
@@ -331,6 +555,60 @@ export const definitions: DefinitionWithExtend[] = [
             await reporting.thermostatAcLouverPosition(endpoint);
         },
     },
+    {
+        zigbeeModel: ["AC221"],
+        model: "AC221",
+        vendor: "OWON",
+        description: "AC controller / IR blaster",
+        extend: [m.deviceAddCustomCluster("manuSpecificOwonAc", OwonClustersDefinition.manuSpecificOwonAc)],
+        fromZigbee: [fz.fan, fz.thermostat, fzLocal.owonAcOneKeyPairingResponse, fzLocal.owonAcReadPairingCodeResponse],
+        toZigbee: [
+            tz.fan_mode,
+            tz.thermostat_system_mode,
+            tz.thermostat_occupied_heating_setpoint,
+            tz.thermostat_occupied_cooling_setpoint,
+            tz.thermostat_ac_louver_position,
+            tz.thermostat_local_temperature,
+            tzLocal.owonAcOneKeyPairing,
+            tzLocal.owonAcWritePairingCode,
+            tzLocal.owonAcReadPairingCode,
+        ],
+
+        exposes: [
+            // --- One Key Pairing Exposes ---
+            e.enum("one_key_pairing", ea.SET, ["start", "end"]),
+            e.text("one_key_pairing_status", ea.STATE).withDescription("Status of the last one key pairing request command."),
+            e.text("one_key_pairing_result", ea.STATE).withDescription("Final result of one key pairing process (JSON string, device reported)."),
+            e
+                .numeric("pairing_code_current", ea.STATE_GET)
+                .withDescription("Currently set pairing code on the device (null if invalid)")
+                .withUnit("")
+                .withValueMin(0)
+                .withValueMax(65535),
+            e.text("pairing_code", ea.SET).withDescription("Manually write pairing code to device  (decimal digits only, e.g. 123456)."),
+            e
+                .climate()
+                .withSystemMode(["off", "heat", "cool", "auto", "dry", "fan_only"])
+                .withSetpoint("occupied_heating_setpoint", 8, 30, 1)
+                .withSetpoint("occupied_cooling_setpoint", 8, 30, 1)
+                .withLocalTemperature(),
+            e.fan().withModes(["low", "medium", "high", "on", "auto"]),
+        ],
+
+        configure: async (device, coordinatorEndpoint) => {
+            const endpoint = device.getEndpoint(1);
+            const binds = ["genBasic", "genIdentify", "genTime", "hvacThermostat", "hvacFanCtrl"];
+
+            await reporting.bind(endpoint, coordinatorEndpoint, binds);
+
+            await reporting.thermostatTemperature(endpoint, {min: 60, max: 600, change: 0.1});
+            await reporting.thermostatOccupiedHeatingSetpoint(endpoint);
+            await reporting.thermostatOccupiedCoolingSetpoint(endpoint);
+            await reporting.thermostatSystemMode(endpoint);
+
+            await reporting.fanMode(endpoint);
+        },
+    },
     {
         zigbeeModel: ["THS317"],
         model: "THS317",
@@ -604,19 +882,19 @@ export const definitions: DefinitionWithExtend[] = [
                 ID: 0xfd00,
                 manufacturerCode: Zcl.ManufacturerCode.OWON_TECHNOLOGY_INC,
                 attributes: {
-                    status: {ID: 0x0000, type: Zcl.DataType.ENUM8, write: true, max: 0xff},
-                    breathing_rate: {ID: 0x0002, type: Zcl.DataType.UINT8, write: true, max: 0xff},
-                    location_x: {ID: 0x0003, type: Zcl.DataType.INT16, write: true, min: -32768},
-                    location_y: {ID: 0x0004, type: Zcl.DataType.INT16, write: true, min: -32768},
-                    bedUpperLeftX: {ID: 0x0100, type: Zcl.DataType.INT16, write: true, min: -32768},
-                    bedUpperLeftY: {ID: 0x0101, type: Zcl.DataType.INT16, write: true, min: -32768},
-                    bedLowerRightX: {ID: 0x0102, type: Zcl.DataType.INT16, write: true, min: -32768},
-                    bedLowerRightY: {ID: 0x0103, type: Zcl.DataType.INT16, write: true, min: -32768},
-                    doorCenterX: {ID: 0x0108, type: Zcl.DataType.INT16, write: true, min: -32768},
-                    doorCenterY: {ID: 0x0109, type: Zcl.DataType.INT16, write: true, min: -32768},
-                    leftFallDetectionRange: {ID: 0x010c, type: Zcl.DataType.UINT16, write: true, max: 0xffff},
-                    rightFallDetectionRange: {ID: 0x010d, type: Zcl.DataType.UINT16, write: true, max: 0xffff},
-                    frontFallDetectionRange: {ID: 0x010e, type: Zcl.DataType.UINT16, write: true, max: 0xffff},
+                    status: {ID: 0x0000, type: Zcl.DataType.ENUM8},
+                    breathing_rate: {ID: 0x0002, type: Zcl.DataType.UINT8},
+                    location_x: {ID: 0x0003, type: Zcl.DataType.INT16},
+                    location_y: {ID: 0x0004, type: Zcl.DataType.INT16},
+                    bedUpperLeftX: {ID: 0x0100, type: Zcl.DataType.INT16},
+                    bedUpperLeftY: {ID: 0x0101, type: Zcl.DataType.INT16},
+                    bedLowerRightX: {ID: 0x0102, type: Zcl.DataType.INT16},
+                    bedLowerRightY: {ID: 0x0103, type: Zcl.DataType.INT16},
+                    doorCenterX: {ID: 0x0108, type: Zcl.DataType.INT16},
+                    doorCenterY: {ID: 0x0109, type: Zcl.DataType.INT16},
+                    leftFallDetectionRange: {ID: 0x010c, type: Zcl.DataType.UINT16},
+                    rightFallDetectionRange: {ID: 0x010d, type: Zcl.DataType.UINT16},
+                    frontFallDetectionRange: {ID: 0x010e, type: Zcl.DataType.UINT16},
                 },
                 commands: {},
                 commandsResponse: {},
@@ -648,13 +926,19 @@ export const definitions: DefinitionWithExtend[] = [
         vendor: "OWON",
         description: "Smart plug with doorbell press indicator",
         extend: [
-            m.onOff({endpointNames: ["l1", "l2", "l3"]}),
+            m.deviceEndpoints({
+                endpoints: {
+                    l1: 1,
+                    l2: 2,
+                    l3: 3,
+                },
+            }),
+            m.onOff({endpointNames: ["l1", "l2", "l3"], powerOnBehavior: false}),
             m.iasZoneAlarm({
                 zoneType: "contact",
                 zoneAttributes: ["alarm_2"],
             }),
         ],
-        endpoint: (device) => ({l1: 1, l2: 2, l3: 3}),
         configure: async (device, coordinatorEndpoint) => {
             const ep2 = device.getEndpoint(2);
             if (ep2) {