Compatible with for 40V Li-ion battery. Suitable for V7, V8 series handheld vacuum cleaners. It provides over-voltage, over-current, overheats and short circuit protection. Notes: 1. Don't charge for battery through this adapter converter. please remove the adapter before charging for battery. 2. ONLY fit for V7 V8 series vacuum cleaners. Don't use this battery adapter for other series vacuum cleaner. 3. Only one battery adapter for to included in the package, battery is not included in the package. 4. If you wanna hang your vacuum cleaners on your wall mount, please battery first. This adapter doesn't support the wall mount. Colour:dark gray Material:ABS Package Contents: 1 x Battery Adapter 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.