Original replacement pads(electrodes) and lead wires for REBOUND Model No. BTR Non-Prescripton TENS device (Sold Seperately). The Refill Kit contains (6) each electrode pads and (1) connecting lead wire set. The Rebound Refill Kit supplies are the only accessories approved for use with the Rebound TENS device model BTR recommended by Biomedical Life Systems, Inc. The use of any other accessories could affect the performance of the device, damage the REBOUND, void the REBOUND warranty, or cause injury to the user.