Features: White Noise Machine: There are 7 relaxing and soothing sounds designed to mimic the natural environment: bird song, insect song, water sound, raining sound, wind sound, campfire sound, and train sound, creating an atmosphere of calm for sleeping. Wireless BT Speaker: Double click the POWER button to change between BT mode and white noise mode. Easy to connect to your smartphones or other BT-enabled audio devices to play wireless music. (Note: Timing function does not work in BT mode.) Compact and Portable: This portable sound machine is lightweight, compact, and easily fits into your bag, or suitcase, convenient to carry it with you when travel. Suitable for use when sleeping at home, working in the office, breast-feeding or travel. Ideal for adults, children, and babies! Timer and Volume Controls: You can set it for continuous play or setting a timer 15, 30, 60 minutes auto-off; you can also adjust the volume with convenient buttons - long press the MODE button to decrease volume, and long press TIMER button to increase volume. Cordless & Rechargeable: Built-in 500mAh battery can last up to 15 hours of working time. It can be fully recharged via the included Type-C charging cable in about 1 hour. Buy one to create a comfortable sleeping atmosphere, achieving deep sleep. Specifications: BT Version: 5.0 Transmission Distance: about 10m (no obstacle) Frequency Response: 20Hz-20KHz Output Power: 3W Audio Decode: MP3, ACS, AAC, WAV, etc. Battery Capacity: 500mAh Working Time: about 5 hours Charging Time: about 1 hour Charging Port: Type-C Input Voltage: 5V 1A Color: Black, White, Pink (Optional) Item Size: 8.0*8.0*1.3cm/3.15*3.15*0.51in Item Weight: 50g/1.76oz Package Size: 14.6*10.5*2.0cm/5.74*4.13*0.78in Package Weight: 123g/4.33oz Package List: 1 * Sleep Machine 1 * Charging Cable 1 * User Manual (English/Chinese)