Red Light Device - Designed for pain relief injury recovery and muscle relaxation. This device can be used multiple times per day and it is safe for all skin types. [10.6 inch x 7.4 inch x 2.3 inch] Double-sided Pad design 88pcs 660nm red lights and 88pcs 880nm infrared lights evenly distributed around the hand. The large internal space is suitable for most people s sizes. Auto shut-off timer（20 minutes)- Do not exceed 40 minutes of use in one therapy session cool your body and have some water before next applying. Wide voltage AC 100 - 240 V DC 12 V. 15 Ft power cord is long enough in the range of your activity.