Smart WiFi Touch Wall Switch Sonoff TX T5 4C (4-channel)Sonoff TX T5 4C (4 channel) Wi Fi smart touch wall switch. Create a smart home with Sonoff. The TX T5 4C is a 4 channel wall switch that allows you to control your lighting conveniently. You can also control it remotely using voice commands or the eWeLink app. What's more, the product offers a timer function and colorful LED backlighting that you can customize. You can also personalize the look of the switch using the color panels (not included).