ONE Button Operation: Easy to Use. Long press the power button to switch on/off the machine; short press it to change 5 modes; double press the button to turn on/off the music. Built-in Music: Bluetooth Connectivity Support. The massager has 3 pieces of built-in music. Also, it supports Bluetooth connectivity, so you can play preferable songs. Bluetooth Name: Eye Massager AR210. 180° Foldable, Size Adjustable: The electric eye massager can be folded into a smaller one, so you can take it to the office, airplane, traveling. Besides, the headband can be easily adjusted in length and suitable for most faces. If you feel too tight or too loose, please adjust your headband to find the right length. Rechargeable Design: The massager takes 3 hours to be fully charged, and can be used for about 1 week. We recommend you use it 15 minutes every day (It has a timer lasts 15 minutes). Note: Fully charge before first use.