Eco Friendly Bamboo Electric Toothbrush Biodegradable Nylon Bristles Compostable Vegan Reusable Name: intelligent acoustic wave electric toothbrushModel: C seriesMain power: 2.5WBattery: lithium ion battery 18500/1200mAh 3.7vCharging seat input: 5v DC 500mAMaterial for Handle: PlasticMaterial for toothbrush head: BambooStorage And Recharge Of The Toothbrush1 During its first usage like newly bought products and if you haven' t use it for 3 months andover, you'll need to charge it regarding the rest of the power.2 The suitable temperature is between 5 degree to 35 degree If the temp is over or below, it willcause the charger can' t charge nommally or can' t charge at all3.To keep sufficient battery, it' s advised to charge 2 times separately to save up the charging time too4. It is nommal the temp of machine goes up at using and charging timeCharging Instructions1 charging time about 7hours2 Charging status mode light goes into flashing status and it goes off after 3 seconds then it goes to charging status3 Charging complete when the when the intersity ight Green goes on and stays on4 Low battery alert when the tensity light yellow fickering press the on/off button and yellow light goes off after 2 seconds' flickering5 Battery infommation all five 5 LED ights on the same time mearns the capacity is over 90%;if it' s 4 lights, capacity over 75%if it' s 3 ights on, capacity over 50%;2ights on, capacty over 25%;1light on, capacity over 15%.If the yelow light goes on it means capacity is below 10%, it will repeat for 4 times for reminding.