Item Type: Sleep Sound MachineMaterial: ABSBattery Type: Polymer Lithium BatteryRated Battery Voltage: 3.7VRated Capacity: 800mA(Included)Serial and Parallel Mode: Single StringCycle Life: 500 TimesInput Voltage: 5V/0.6A (Maximum)Charging Time: 2hSound Types: 24 Volume Range: 0~80dBTiming Function: 30min/60min/90minPlay Switch: Manual Cycle SwitchVolume Adjustment: ManualPlay Time: 24 Hours (Maximum Volume)Temperature: -10~+40/ 14F~104FHumidity RH: 10-90%Package List1 x Sleep Sound Machine1 x Charging Cable1 x Manual1Soothes emotions and helps sleep, at the same time, can screen the ambient noise. 224 highfidelity sounds, including 8 white noises, 8 fan sounds and 8 nature sounds, suitable for different groups of people. 3The built-in battery is charged with a USB cable, and the charging time is about 1.5 hours. 4With timer setting function, you can set 30min/60min/90min, control the time for your own need. 5With smart storage function, it will automatically restore to the same state as when it was closed before.