Specifications:Main material: ABSMain color: whitePower: 1 W (max)Battery: 3.7V 800 mAhCharging time: 1HOperating time: 50HSize: 8 * 8 * 3.4 cmWeight: approx 97gPacking list:1 * machine for sleeping1 * USB charging cable1 * user manualCharacteristics:9 Soothing sleep noises - white noise, ocean waves, crickets, rain noises, forest bird noises, stream noises, 3 lullabies. Sound can help you fall asleep faster, improve sleep, and have a good nights sleep.Time options - 3 types of time information, 15 minutes / 30 minutes / 60 minutes /. Press the Time button for the first time, the sound will play for 15 minutes, press the Time button the second time, the sound will be played for 30 minutes, press the Time button for the third Time, the sound will play for 60 minutes.Mini Portable Design - The size only 8 * 8 * 3.4 cm, mini and portable, weight only 97 g. Its also very convenient to take with you when traveling.USB charging - the built-in rechargeable sleep instrument with 800 mAh and USB charging cable. The sleep instrument can work for 50 hours after a full charge of 1 hour.Note:* There may be some discrepancy due to manual measurement or slight color difference due to shooting conditions. Thank you for your comprehension.