User manual: https://img.staticbg.com/file/products/20171129031738SKU561913.pdf

Power:

Transistor tester can be powered from 6.8V – 12V DC. This can be achieve by a 9V layer-built battery, two 3.7V
Lithium-ion battery in series, or AC adapter. When power on, the current is about 30mA at DC 9V.

Note:

It is assumed that users have soldering skills and troubleshooting skills to assemble this kit. Buyers are advised that due to skills of user is involved in assembly it is not guaranteed every kit will end up being a working device. But we will make as much efforts as we can to approach that goal.
We don't supply instructions about how to soldering this kit.

Package includes:

1 x DIY Mega328 Transistor Tester