Featuring the 300ML tank and 1400mAh rechargeable battery, cordless water flosser can offer you the best using experience while clean your teeth. You don't have to worry the water is using up, or the battery is dead while travel. Only need charge 4 hours for 15-20 days using.Build-in 1400mAh BatteryWith built-in 1400 mAh rechargeable battery, Charging 4 hours for 16-20 days using.360 Rotatable DesignWith the 360-degree rotating nozzle, you can clean your teeth from different angles as you like.300ml Water Tank with IndicatorUpdated 300ml water tank with special design can help you avoiding splashing water. and to help you check water volume, we put a blue light in the water tank.Thank you very much for your trust and support, and I wish you a happy life.