SENSIV MULTI-CHANNEL PAIN RELIEF TENS UNIT, SOLD AS 1/EACH ACUTENS SENTENSM 1/EACH -SENTENSM1 EACH Plug TENS pads to TENS unit, then attach TENS pads to spots on your body where there are sore and aching muscles: Use unit to select one automatic or one of four manual modes . Use on shoulders, arms, legs, feet, back and joints; not on thorax or upper back . Four modes for different therapy needs . Batteries included . Pads are durable but replacement pads are readily available when you need them . SKU: SENTENSM MCK 1236457_EA Brand: Sensiv