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20 AAA alkaline batteries.

Connection mode: 2.4 GHz USB receiver
Sensor - Pixart 3065
Sensor type: Optical
Number of buttons: 4
Resolution: 800/1200/1600 DPI
Button life cycle: 3 million clicks
Battery: AA*1
Διαστάσεις:110*62*37mm
Transmission range: approx: 10m

Designed to provide finger support during daily work (for right-handed people).
Particularly elegant and convenient and with a sensor created by Pixart, it allows operation even on smooth surfaces.
It connects wirelessly at 2.4 GHz via the USB receiver and ensures uninterrupted communication with the computer.
It has 4 durable buttons which can withstand up to 3 million clicks.
- Connection: 2.4 GHz wireless USB 
1600 dpi

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.