Prospera Electronic Pulse massager is a compact, portable, microcomputer-controlled device. It may help temporary relief of pain associated with sore and aching muscles in the shoulder, waist, back, neck, arm, and leg due to strain from exercise or normal household work activities.fda approved, long lasting most popular item to treat pain and relieve stress.Products details:• Five Auto Modes (stimulation programs)• Three selectable massages• High frequency stimulation to relieve pain quickly• Lcd shows massage style, intensity and time remaining• Extra pads for value buy, total 8 padsProduct Specifications• Power: DC6V (4 Aaa batteries)• Dimensions 8"" x 2"" x 1"" plus attachment pads.• Weighs 0.5 lbs (approx.)• Fda 510K approved K113544 Prescription• Fda 510K approved K122744 Otc• Us D666,161S