It uses the GPIO0 from ESP-01 / 01S to control the relay at low level.

With this smart relay, it is easy to make a smart switch that you can control from anywhere with your smartphone.

It supports the APP and LUA source code, it can be used for smart home, IoT and other DIY projects.

Specifications:

Working voltage: DC 5V-12V

Working current: ≥250mA

Communication: ESP01 of ESP 01S WiFi module

Transmission distance: the maximum transmission distance is 400m (open environment, mobile phone equipped with WiFi module)

Load: 10A / 250VAC, 10A / 30VDC, 10A / 30VDC, 10A / 28VDC

Size: 37 x 25 mm.