XUEMEI White noise machine has 20 soothing sounds that allow you to select the perfect channel and get ready for your rest.This sound machine features night light that can emit a warm light and provide a good sense of safety.The sound machine allows you to setup optional 15, 30, and 60mins automatic shut-off timer.The sound machine remembers your last settings of the sound and volume level when you next turn it on.This white noise sound machine is small and lightweight, portable for home and travel use.Specification:Material: ABS.Size: 90x90x31mm.Color: White.Input voltage: DC5V.Working voltage: 3.7V.Battery capacity: 1200mah.(Built-in)Use time: 15~30 hours.Charging time: 1.5 hours.NoteThere might be a bit color distortions due to different computer resolutions.There might be a slight errors due to different hand measurement.Package included:1x White noise machine.(Battery built-in)1x USB cable.