The SKYGOO eye esthetic massager is equipped with a 1200mAh battery and designed with a comfortable synthetic leather headband. - Model: SKYGOO - Capacity: 1200mAh - Input Voltage: 5V 0.4A - Output Voltage: 5V 0.2A - Material: Synthetic Leather - Design: Headband style Thank you for viewing. It has Bluetooth, giving you the strange sensation that only you can hear the sound! It's incredibly refreshing to use when you want to rest your eyes!