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It can be used to increase maximal load of controller transistor output line and for galvanic isolation between output line and load point.

SPECIFICATION
Number of relay outputs: 1 
Power supply: 10  ... 14 V DC
Current consumption: 20 mA (max) @ 12 V DC
Relay maximal load: 1 A (max), 30 V DC / 50 V AC (max)
Output: 1 x NO / NC
Operation temp: -10 °C ... 50 °C
Weight: 0.02 kg
Dimensions: 30  x 27  x 18 mm
Manufacturer / Brand: PULSAR

Number of relay outputs: 1Power supply: • 10 ... 16 V DC,Relay maximal load: 1 A (max) 30 V DC / 50 V AC (max)Output: 1 x NO/NCManufacturer / Brand: PULSARGuarantee: 2 years

It is a mini and compact DIY smart switch used for different kinds of switch boxes, even the smallest standard EU switch box. It is convenient to automate your home appliances with the eWeLink app via your smartphone or tablet or voice command. Support for connecting an external lamp switch for easy management of connected devices in your home, both on your phone or directly. Supports DIY (designed for developers) mode that allows users to integrate the MINI into a third-party open source global smart home control system to achieve LAN control without cloud service, such as Home Assistant, openHAB, ioBroker, etc.

The Smart Switch Sonoff RFR2 WiFi M0802010002,
is constructed in such a way,
to convert your home appliances,
to smart, so you can control them remotely.