Specifications: Main material: ABS Main color: white Power: 1 W (max) Battery: 3.7V 800 mAh Charging time: 1H Operating time: 50H Size: 8 * 8 * 3.4 cm Weight: approx 97g Packing list: 1 * machine for sleeping 1 * USB charging cable 1 * user manual Characteristics: 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 night s 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. It s 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.