Upper Interface Compatible for V6,V7 & V8 Vacuum Cleaners: The version adapter is compatible for V6 series,V7 SV11 and V8 SV10 series vacuum cleaners, such as V6 Animal/V6 Absolute/V6 /SV03/SV04/SV05/SV06/SV07/SV09/DC58/DC59/DC61/DC62/DC72/DC74/V7 Animal/V7 V7 Trigger/V7 Car+Boat/V7 Absolute/SV11/V7 Trigger/V7 Extra/V7 Mattress/V7 Allergy/V7 Total Clean/V8 Absolute/V8 /V8 Animal/V8 Animal/V8 Absolute Stick Vacuum Cleaner. [For 20V Battery Adapter] The battery adapter works for 20V lithium battery (Battery not included). We suggest using 4AH or higher volume of for Dewolt 20V battery. The using time of DW20 V6 V7 V8 adapter depends on your battery volume and life. There are 2 buckles on the adapter, you just need to simply insert the battery into the adapter, push open two buckles, plug the adapter with the battery into the vacuum cleaner, and push the buckles back to secure the connection. And if you want to connect this adapter to the battery more firmly, you can tighten it with screws because there is another screw hole. Attention Please: our adapter is just a converter, it does not consume any energy. So the vacuum cleaner's work depends entirely on the battery. For this situation, we recommend that you'd better to use a and high capacity battery.(Batteries not included) Warm Tips: Although our adapter is almost the same in shape and design as the V6 battery, it is not only suitable for V6 vacuum cleaners, but also for V7 and V8 vacuum cleaners. But adapter is incompatible with other series. Color:As Shown Material:plastic Package Contents: 1 * Adapter Converter (Batteries not included) 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.