This is a self-made item. It was created with the intention of lowering the voltage during a race. It's a Tamiya battery level checker, compatible with two AA batteries. Batteries are not included. - Brand: Tamiya - Model Name: Battery Checker - Function: Battery level measurement - Battery Type: AA batteries (2) Thank you for viewing. This is a used item, so please refrain from purchasing if you are sensitive to imperfections or seek a perfect product. No returns or exchanges accepted.