Energy SavingThe auto power-off function will switch to off when the table vacuum cleaner does not work for 15 minutes, which ensures a high endurance from just one charge. High capacity lithium-ion battery provides up to 400 minutes of continuous cleaning time, just charge for 2-3 hours. 1600 mAh Built-in Rechargeable BatteryFeatures a powerful 1600mAh built-in rechargeable battery. With the in-built battery, you can move and use it everywhere and our dust sweeper can be charged by car charger, mobile adapter, power bank, computer etc.