The board is a custom ESP8266-based smart wall switch.

It's singularity is that it's meant to be embedded into the wall behind a standard wall switch, replacing the mechanic switch with a wifi-enabled smart switch.

The board is based on the HLW8012 power monitor IC,

the same the Sonoff POW uses.

It features:

SPDT 10A relay with NO and NC connections brought out

Connections for external button and notification LED

HLW8012 chip for power monitoring

50x50mm low profile form factor to fit in the wall switch hole

(H) Optional, only required for power monitor.

(units) Minimum quantity for the stated price.

Prices are based on the cheapest option, usually Aliexpress.

Check the schematic (image or eagle file) for relation between parts and values.

Support for multiple ESP8266-based boards (check list)

Support for up to 5 different network configurations

Support for different types of switches and different options

(pulses, synchronization,..)

MQTT enabled

Alexa integration using the FauxmoESP Library

Domoticz integration via MQTT

Home Assistant integration via MQTT

Support for different sensors 

(DHT22, DS18B20, HLW8012, current sensors, analog sensors,...)

Fast asynchronous HTTP Server

Backup and restore settings option

Upgrade firmware from the web interface

REST API (enable/disable from web interface)

Over-The-Air (OTA) updates

... and much more