Work with for 18V Li-ion Battery. The red wire is connected to the positive battery terminal, and the black wire is connected to the negative battery terminal. Easy to install,locks on you battery very well. It can provide DC 18V power for the tools. (Such as toy cars, LED lights, various tools). When using, pay attention to the black wires and the red wires not to touch each other to prevent short circuit. Battery Voltage:18V Compatible with:For 18V Li-ion Battery Suitable for 18V tools Colour:black Material:ABS Package Contents: 2 x Adapter for 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.