PL009-p Replacement refill Pads. Fda approved formula. Proprietary technology. Electric pulses evenly distributed. Pain relief. Soothing effect.Skin applicable areas: neck and shoulders, back, waist, arms and legs, joints and ankles. A set of four, perfect for the Prospera DL003, PL009, PL029 Tens Electronic Pulse Massagers and Tens socks combo. Compact, lightweight, easy to carry and use. Comes with a plastic bag.