Battery capacity: 500mAh Packing quantity: 60pcs Input voltage: DC 5V/1A Working power: 0.5W Charging interface: Micro USB Life time: 20 hours Battery capacity: 500mAH/3.7V (1.85wh) Recommended time: 15 minutes/time Product material: ABS stainless steel Color: gray/orange/blue Product size: 25*32*70mm Product packaging: 58*78*120mm Net weight: 41g Product gross weight: 144g Package Included: 1*Sleep Instrument 1*charging cbale 1*Instructions Notes: Precautions *Because this product does not specifically carry out side effect tests and observations for the following people, it is not clear whether it is harmful to this group of people. Based on the safety of patients, we do not recommend the following people to use this product: 1. Patients using implanted electronic devices (such as cardiac pacemakers, insulin pumps) should be used with caution; 2. It is forbidden to use with high-frequency surgical equipment, short-wave or microwave therapy equipm