Video explanation of garage door installation, universal for 1/2/4 channel WiFi module Wifi 4 Channel Relay (Three Working Modes) Use for 1.Remotely give a pulse signal to turn on/off Lights,Lamps and other home appliance. 2.Remotely give a pulse signal to turn on/off Garage Door,Door Access 3.Remotely give a pulse signal to control DC Motor,AC Motor to Forward and Reverse *The RF433 remote controller don't include battery battery type:27A 12V/23A 12V *The picture of the battery is in the end of the page. Overview: This product is a 4/2/1 channels universal WiFi wireless smart switch with RF 433MHz module, for your smart home system to remotely and automatically turn on/off home appliances and electronic devices by phone APP. It also can be controlled by RF remote controller indoors. It can connect and control four appliances on APP at the same time, and you can independently turn on/off each of the four gangs. It also supports timing turning on/off the appliances at a specified time, and share to others so that you can control your smart home together with your family. You can also voice control your home appliances by Amazon Alexa, and for Google Home/Nest,IFTTT, and enjoy intelligent life and make your home smarter. Features: *App Support: Free iOS and for Android mobile App eWeLink. *Sync Status: Real-time device status provided to App. *Remote ON/OFF: Turn 4 electrical devices on/off remotely from anywhere. *RF Remote control: Turn on/off by 433MHz RF Remote indoors. *3 Working Modes: Switch among interlock/self-locking/inching modes. *Independent control: Control each gang separately in APP eWeLink. *Supports remotely turn on or off connected appliances, for example light, electric kettle, electric rice cooker, electric curtain, etc. *Timing: Supports 8 enabled countdown/single/repeat timing tasks to turn on/off at specified time. *DIN Rail Mounted: Great for industrial control. *Voice Control: Compatible perfectly with Amazon Alexa, for Google Home, for Google Nest,IFTTT. *Share Control: Control your smart home together with your family. Specifications: Power Supply: DC/AC 7V-32V / USB5V or AC 85V~250V / USB 5V Max. Current: 10A/gang, 16A/Total Max. Power: 2000W/10A/gang, 3500W/16A/Total Operating Temperature(recommended): -20C-70C Operating Humidity: 5%-90%RH, Non-condensing Transmission mode: Wi-Fi communication,RF Remote Control Wireless Standard: 2.4GHz, 802.11 b/g/n Security Mechanism: WPA-PSK/WPA2-PSK Enclosure Material: Fire-retardant ABS V0 Gang: 4 Product Size: Approx. 112*83*26 (mm) Selling point: Introduction to the 4CH wiring diagram Introduction to the 2CH wiring diagram Introduction to the 1CH wiring diagram 433MHz Remote Control: Operating voltage: DC12V (27A/12V Without battery) Transmitting frequency: 433MHz Encoding Type: Learning code Transmission distance : 10-100M (Open field) Free screwdriver