WiFi Smart Relay
Already flashed with the latest Tasmota firmware.
It is a 5V WiFi Inching/Selflock Relais module from Sonoff
The 5V DC input, the nanogrens and the drying contact output distinguish it from conventional sonoff products. There are two working modes for the product: tip mode and self -locking mode.
If the module is connected to self-locking mode, users can switch the connected device on or off immediately.
If the module is connected to the tip, users can press the on/off switch key to switch on or off connected devices.