High quality: Our V7V8 series adapter has several safe protection devices. It is made of fireproof ABS material and provides over-voltage, over-current, and over-temperature protection, safe and reliable. Compatible with for Dyson V7V8 vacuum cleaners: compatible with for Dyson V7 series, for Dyson V7/V8 series, Convert them to for Dyson V8 series cordless vacuum cleaner batteries.(NOTE:adapter onlt,no battery) Compatible with for Dewalt 20 V lithium battery: compatible with for Dewalt 18 V/20 V max battery DCB200, DCB200-2, DCB201, DCB203, DCB204, DCB204-2, DCB207, DCB206, DCB206-2 model tool battery. Smart protection system: this for V7/V8 adapter has built-in over-discharge, over-voltage, over-current and over-temperature protection, safe and reliable. It is equipped with an indicator light, when the light is "green" it indicates normal work, and once the light changes to "red", it means that the battery is empty. 24 hours online service: 24 hours friendly customer support, 1 year warranty, if you have any problems with your adapter, please contact us to help you solve the solution .