This electronic pulse massager is a compact, portable, micro-computer controlled device. It can be used in many areas in your body, including arms, neck and shoulders, back, low back, legs, feet, joints etc. It may help to relieve pain and numbness in the following situations: Stiff neck; Muscle pains from over-exercise or stretch; Numbness from some chronic condition; Carpal-tunnel syndrome; Relieve pain and relax muscle spasms, or may prevent muscle atrophy.