Work with for Makita 18V Li-ion Battery. The red cord is connected to the wonderful battery terminal, and the black twine is connected to the harmful battery terminal. Easy to install,locks on you battery very well. It can provide DC 18V energy for the tools. (Such as toy cars, LED lights, varied tools). When using, listen in on the black wires and the red wires to not contact one another to stop quick circuit. Battery Voltage:18V Compatible with:For Makita 18V Li-ion Battery Suitable for 18V devices Colour:black Material:ABS Package Contents: 1 x Adapter for Makita Only the above package content, different merchandise should not included. Note: Light reflection and various displays can cause the colour of the thing within the picture slightly diverse from the real thing. The size allowed error is +/- 1-3cm.