Features: Smart recording function can comfort your child to fall asleep quickly. It can intelligently detect and automatically play recordings. It can reduce noise and create a good sleeping environment for your child. Made of environmentally friendly and healthy materials, so you don't have to worry about harm to your child. Ring lanyard, small and portable size is ideal for travel. Rechargeable lithium battery and a knob for adjusting volume give you a better experience. Specifications: Condition: Brand New Color: Shown as Picture Model: S7 Source: 15 Sources Speaker: Diameter 50mm, 8Ω 0.5W, inner magnet shell Power: DC 5V, 1A Data Line Length: 1.2m/47.2 in Material: ABS Plastic + PP Lithium Battery: 3.7V/1800mAh Size: Approx. 75 x 36 x 133 mm/3.0 * 1.4 * 5.2 in Package List: 1 * Sound Therapy Machine 1 * USB Cable 1 * Manual Note: Please allow 1-2 cm error due to manual measurement. Thanks for your understanding. 1、Smart recording function can comfort your child to fall asleep quickly. 2、It can intelligently detect and automatically play recordings. 3、It can reduce noise and create a good sleeping environment for your child. 4、Made of environmentally friendly and healthy materials, so you don't have to worry about harm to your child. 5、Ring lanyard, small and portable size is ideal for travel.