Features: Sound machine for sleeping & relaxation 9 soothing sounds: white noise, birdsong, cricket sound, bicker, wave sound, waterfall, lullaby, wind sound, musical instrument Featuring 3 timer options, 15, 30, 60min auto-off timer options Built-in lithium battery and USB charging Compact size, easy to carry Specification: Material: ABS Colour: white Size: 8 x 8 x 3.3cm Input Voltage: DC5V=0.5-1.0A Power: 1W Battery: Li-ion18650-1200mAh Charging Time: 1-1.5h Use Time: 30-36h Package Contents: 1 x white noise machine 1 x USB cable 1 x manual