Name: SM series Knob MOS Dimmer Switch Material of Knob Cover: Glass Size: 86x86x45.5mm Installation distance between two screws from backside: 60mm Protocol: Zigbee 3.0 Rated Voltage: AC 100-250V/50-60Hz Rated Power: LED lights/300W(Max.), Resistance Load/600W(Max.) Wireless Frequency: 2.4GHz Wireless Standard: IEEE802.11b/g/n Working Temperature: -20℃-70℃ Standby power consumption: ≤0.2W Working Humidity:≤95% Control Method: Press key/ Knob/APP/Voice Supported APP:Tuya/Smart Life Supported Smart Speaker: Amazon Alexa/Google Home/and so on Neutral Wire Required Or Not: yes Colour:Grey / black / white Material:plastic+metal Package Contents: 1 * Knob Dimmer(The printed words are slightly different, which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.