Works with 18V -ion battery only. Added and equipped a fuse and switch, which can increase the safety of the product. The main role of a fuse is to protect electrical equipment from overcurrent and overheating. The fuse is properly placed in the circuit. When the current abnormally rises to a certain height and heats up, it will fuse and cut off the current to protect the safe operation of the circuit. This battery adapter locks your battery nicely, installation is very simple, just gently move the power installation connector. The battery adapter is made of high quality material, the battery adapter is durable and . working principle: Connect this product to for the 18V lithium-ion battery, and use two wires to draw out the battery power for use by other devices of the same voltage, as a helper for DIY players, such as small DC fans, heating clothing, electric toy modification, etc. color:Photo color Material:plastic Package Contents: 1 x Converter 3 x fuse 4 x U-shaped terminal 1 x wire terminal 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.