What's Dry Contact Switch Module: The dry contact module is a versatile electrical switch that responds to external signals, controlling other electrical equipment. With no need to worry about directions or polarity during installation, simply ensure the correct signal current and voltage levels are maintained. Why Choose Dry Contact Module: Compatible with mechanical reset switch and rocker switch,suitable for various mounting boxes. Neutral wire is required. APP Remote Control: Turn on/off the devices effortlessly from anywhere after connected the module to TuyaSmart/Smart Life APP. Convenient Voice Control: Just need simple voice commands to trigger the dry contact through Alexa/Google Home Assistant,turn on/off the device effortlessly and more conveniently. Enjoy your smart life. Timer Schedule: With flexible timer setting, you can trigger connected devices on time while saving energy. Relay Status Function: With Relay Status Function, you won't have to worry about power outages as you can set on/off/remember the last status of the smart dry contact as relay status. Product Type:WiFi Smart Switch Module Relay:NO Max. Load:LED 300W, 10A Operation Temp.:-10- +40 Working Humidity:less than equal 90% WIFI Protocol:IEEE 802.11b/g/n Operation Frequency:2.412GHz-2.484GHz APP:TuyaSmart/Smart Life Voice:for Alexa/for Google Home Assistant Warm Tips:When using in access control systems or electronic control locks, you need to enable the "inching switch" function. Inpute Voltage:DC 8-40V Colour:White Material:ABS+PC Package Contents: 1 * Tuya Smart WiFi Dry Contact Switch Module 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.