Great tool for precise hair cutting for men With adjustable guiding comb that covers the range from 3-24 mm Has a Memory SafetyLock system that smartly locks and memorizes the last used length setting even after removing the attachment Ultra sharp blades for precision cutting and engineered for long lasting sharpness Fully washable for easy cleaning under running water Powered by a dual battery system using Ni-MH batteries Can be fully charged in 8 hours and can be use for 40 minutes of cordless performance For non-stop operation simply use it corded LED light to indicate when the device is charging and when it is fully charged Automatically adapts to any voltage between 100 V and 240V