Premium replacement pads for Prospera Electronics Pulse Massager and OTC Tens Electronic Pulse Massager. | Prospera refill pads are durable and flexible. Easily apply the self-adhesive pads on the pain area and connect to the Pulse Massager, and you can enjoy the massage. | Why FDA approval? Since electric current produced by a device to be delivered directly to human body and skin to stimulate the nerves for therapeutic purpose, it is under federal regulation that the device specifications and manufacturing process must meet the required efficacy and safety criteria set by the agency. Prospera's Electronics Pulse Massager met all FDA requirements at design level, for all supplied material and components, and at production. | A set of 4 pads.