[ SOUND QUALITY] - Enjoy 16KHZ high-fidelity background sounds for a better sleep experience. [THREE TIMER SHUTDOWN MODES] - Set the machine to automatically turn off after 15, 30, or 60 minutes to meet your different needs. [COVER UP NOISE, IMPROVE SLEEP QUALITY] - Mask unwanted noise and achieve a peaceful sleep at home, office, dormitory, baby room, or anywhere else. [LIGHTWEIGHT AND PORTABLE] - Compact size and lightweight design make it easy to carry wherever you go. [EASY TO CHARGE, LONG ENDURANCE] - Built-in rechargeable battery with 1-hour charging time and up to 23 hours of use. Spec: Condition: Brand New Item Type: White Noise Machine Material: ABS Built-In Battery: Lithium Battery 300mAH Charging Time: 1h Use Time: 23h Music: White Noise, Lullaby 1, Cricket, Sea Wave, Clock, Bird, Heartbeat, Lullaby, Stream Sound, Lullaby 2 Instructions for Use: 1. Press the power button for 1.5 seconds to start the machine, and then play the first piece of music. Short press is to pause, then press again to start playing. 2. Press next song to switch to the next music. Press and hold to increase the volume. When the maximum value is reached, a beep will pops up to indicate that the maximum value has been reached. 3. Press the timer button, once for 15 minutes, the green light is on, press again for 30 minutes, the and green light are on at the same time, press again for 60 minutes, the green, blue, and red lights are on at the same time. Package List: 1 x Sleep Sound Device 1 x USB Cable 1 x Lanyard 1 x Manual[EASY TO CHARGE,ENDURANCE] - Built-in rechargeable battery with 1-hour charging time and up to 23 hours of use. [LIGHTWEIGHT AND PORTABLE] - Compact size and lightweight design make it easy to carry wherever you go. [ SOUND QUALITY] - Enjoy 16KHZ high-fidelity background sounds for a better sleep experience. [COVER UP NOISE, IMPROVE SLEEP QUALITY] - Mask unwanted noise and achieve a peaceful sleep at home, office, dormitory, baby room, or anywhere else. [THREE TIMER SHUTDOWN MODES] - Set the machine to automatically turn off after 15, 30, or 60 minutes to meet your different needs.