Fit for 18-Volt Lithium-Ion battery.Wire length 400 +/- 10mmworking principle: Connect this product to for the 18V lithium-ion battery, and use two wires to draw out the battery 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..This product is only used as an output, not as an input to charge the battery Type: Battery Adaptercolor:Photo colorMaterial:PC+ABSPackage Contents:2 x Battery AdapterOnly 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.