Product Description: wireless eye massager provides air pressure massage/hot compress for tired and stress eyes. Also comes built in memory for music. Built-in memory: 128M supports music download Volume adjustment: 4 positions Air pressure mode: smart cycle air massage Smart button: 4 button operation Rated power: 5W Rated voltage: DC5V Power supply mode: MICRO-USB data fast charge Battery capacity: 1000mAh rechargeable lithium battery