Auvon via Amazon offers its Auvon Rechargeable TENS Unit Muscle Stimulator for $28.98. Coupon code "X9BEVRRW" drops the price to $19.79. Even better, free shipping applies. Buy Now Features 16 pre-programmed massage modes with adjustable intensity backlit LCD screen adjustable timer up to 10 hours of runtime per charge 8 reusable 2" x 2" electrode pads