Specifications:- Overall Dimension(LxWxH): 11 13/16"" x 6 5/16"" x 4 3/4""- Power Cord Length: 46 7/8""- Voltage: 5V- Current: 1A- Battery: 2500mA- Charging Time: 6hrs- Using Time(after fully charged): 120 mins- Auto-off Protection: After working 15 mins- Net Weight: 2.2 Lbs (1 kg). Package Contents:- 1x Hand Massager- 1x Usb Power Cord- 1x Finger Roller Tool- 1x Manual. Notice:- Please ask your therapist for consultation if you have hand or heart disease to make sure our massager is suitable for you to use.- Your hand would be full of spots after using, which is completely normal as our machine made an effective acupoint massage.- Machine will automatically turn off after 15 mins for each massage duration due to original setting to protect your hand from over massage.