The product shown is an Outer UPS Board -42W V4 from RC Product BD. It is a circuit board designed to provide uninterrupted power supply for devices like routers.

Battery input: 2s 8.4V

Charging input: 12V - 24V minimum 2A

Features: It has LED indicators to show battery levels at 100%, 75%, 50%, and 25%. It is also equipped with safety features such as short circuit, overvoltage, and polarity protection

Warranty: The product comes with a 3-month warranty.

Use: It is designed for use with a variety of electronic devices, such as routers and other low-power DC equipment.
Availability: Similar boards are available from various electronics and robotics stores in Bangladesh.