Transcutaneous Electrical Nerve Stimulation (TENS) technology relieves multiple body pains; Durable, comfortable pads; Gently adhere to skin; For use with Omron electroTHERAPY TENS(R) units; Reusable up to 150 times or 5 months; 3.5 x 4; Shaped to fit around curves; FDA cleared & prescription free for home use; Includes 2 large long-life pads with snap connection, holder, instruction manual, quick-start guide & pad placement guide; 30-day limited warranty on pads;