Notice1) Aqara Smart Wall Switch E1 is newest from Xiaomi Ecological chain, can works with APP xiaomi mi home / aqara home / homekit etc .2) The wall switch can connect the wire, can control any bulb through the wire ; while the wireless switch cannot wired, only can control other devices by ZigBee 3.0 gateway3)The E1 wall Switch can works with the zigbee 3.0 gateway (like Xiaomi gateway 2, gateway 3, aqara HUB M1S , E1, M2 , P3 etc .)4) when you connect wall switch to HUB . Xiaomi gateway must use China server , ALL aqara hub supports global server.Main Features1 ) WIRELESS VERSION*The wireless switch has to work with zigbee 3.0 Gateway hub to achieve smart remote control function. Cannot be wired, match with xiaomi or aqara smart bulb or light through ZigBee 3.0* Model ( wireless 1key : WXKG16LM , wireless 2key : WXKG17LM )* Portable, realize controlling everywhere* Wireless connection: ZiGBee 3.0* Built-in CR2032 battery* Support APP : Mi home , aqara home , homekit.2) Aqara Smart Wall Switch E1 (No Neutral)Single Rocker ( 1 key )*Model: QBKG38LM*Dimensions: 86 x 86 x 30.15mm*Wireless Connectivity: Zigbee 3.0*Rated Voltage: 220V--, 50Hz*Rated Power: Max 1100W, Min 3W*Operating Temperature:0°C~40°C*Operating Humidity: 5~95% RH. No condensationDouble Rocker (2 keys)*Model: QBKG39LM*Dimensions: 86 x 86 x 30.15mm*Wireless Connectivity: Zigbee 3.0*Rated Voltage: 220V~,50Hz*Rated Power: Max 1100W, Min 3W*Operating Temperature:0°C~40°C*Operating Humidity: 5~95% RH. No condensation3) Aqara Smart Wall Switch E1 (With Neutral)Single Rocker ( 1 key )*Model: QBKG40LM*Dimensions: 86 x 86x 30.15mm*Wireless Connectivity: Zigbee 3.0*Rated Voltage: Max 10A, 220V~, 50Hz*Rated Power: Max 1100W*Operating Temperature:0" C~40" C*Operating Humidity: 5~95% RH. No condensationDouble Rocker (2 keys)*Model: QBKG41LM*Dimensions: 86 x 86 x 30.15mm*Wireless Connectivity: Zigbee 3.0*Rated Voltage: Max 5A 220V~, 50Hz*Rated Power: Max 1100W*Operating Temperature:0" C~ 40 C*Operating Humidity: 5~95% RH. No condensation