3S-Constant Heat Reduces puffiness and dark circles under the eyes Gentle warm compresses at approx. 40°C, covering a large area around the eyes as comfortable as a hot towel. Intelligent Music Constant temperature Micro-frequency vibration 4 techniques 180° folding Skin-friendly and breathable Product size 21*3*9CM Working mode Hot compress, vibration, music Net weight 0.222kg Battery capacity 650mAh. Gross Weight 0.4208kg Battery Voltage 3.7V, 3.7Wh Gift box size 19.5*18.2*10cm Power supply mode Li-polymer battery Packing Quantity 30pcs/ctn Massage Mode 4 types Box size 57.5*52*41.5CM Charging mode USB charging Weight 15kg Battery life about 4 times Packing method Aircraft box Rated power 3.4W Temperature about 42-45 degrees Rated voltage DC-5V Product material ABS+soft PU leather Charging time 2-3 hours