WK Life’s WT SP01 3 in 1 Smart Car Charger Dual USB Max 5V/2.4A with Shaver and Safety Hammer is accompanied by a polymer lithium battery with a capacity of 160 mAh allows the shaving for continuous 20 minutes. The mini portable design of the device is size 41*105mm is perfect for all the house chores and as well as for travel purposes.