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ENERGENIE ALKALINE D-CELL BATTERY 2-PACK
D-cell LR20 1.5V alkaline battery
High performance and long life
Non-rechargeable

Rated voltage: 3.7 V
Capacity: 2500 mAh
Voltage overload limit: 4.3 ±0.05 V
Voltage overload limit: 2.75 ±0.1 V
Continuous discharge rate: 25 A
Operating temperature: charging 0~45 °C, discharging -20~60 °C
Storage temperature: -20~45 °C
Storage voltage: 3.7-3.85 V
Dimensions: diameter: 18.4 mm, height: 65.2 mm
Net weight: 46 g

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.