[ SOUND QUALITY] - Enjoy 16KHZ high-fidelity background sounds for a better sleep experience. [THREE 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 , office, dormitory, baby room, or anywhere else. [ AND PORTABLE] - Compact size and design easy to carry wherever you . [EASY TO CHARGE,ENDURANCE] - Built-in rechargeable battery with 1-hour charging time and up to 23 hours of use. Colour:White Material:ABS Package Contents: 1x Sleep Monitor 1x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.