An affordable solution to relieve continual strain or trauma-induced pain!Now you can relieve muscle pain from carpal tunnel syndrome, spasms, atrophy or injury without the expense of physical therapy. Prosepra TENS massager provides mild, comfortable electric impulses to stimulate the muscles and help alleviate your pain. Versatile and compact, you can target most areas of your body while relaxing at home or traveling. Use as a kind, rejuvenating therapy to massage your neck, shoulders, lower back or legs from past injuries or after exercising too. Safe and effective, TENS therapy is FDA approved and won't interact with your medications. Uses 4 AAA batteries (included). 8"L x 2"W x 1"D.