1. This battery box is a 2-in-3 series battery box, and the 12V output is not regulated. It is suitable for electrical appliances that do not need to be regulated, such as audio, LED lights, motors, etc., but not for electrical appliances that need to be regulated, such as 12V computers. 2. Because the battery box switch can only pass the rated current of 3A, please use the INPUT port for high current, which does not pass through the switch. 3. There is no charging display on the battery box, and the charging status is displayed through the external 12.6V lithium battery charger, and the charging red light turns green when it is full. Note: Batteries not included Colour:Black Material:ABS Package Contents: 1 x battery box 1 x connection line Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.