Control :Press key/Knob/APP/Voice Supported APP:Tuya/Smart Life Supported Smart Speaker:for Alexa/for Home/for Yandex and so on Neutral Wire Required Or Not:yes Matching Mounting Box:86 type Square box is compatible, could not fit into round box Name:X92 series Knob Dimmer Switch Installation distance between two screws from backside:60mm Protocol:Zigbee 3.0 Rated Voltage:AC 110-250V/50-60Hz Rated Power:LED/150W(Max.), Incandescent lamp/300W,Halogen Lamp/300W(Max.) Wireless Frequency:2.4GHz Wireless Standard:IEEE802.11b/g Colour:White Material:Plastic+Metal Size:86x86x36mm Package Contents: 1 * Knob Dimmer 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.