PR009-p Replacement refill Pads details:• Fda approved formula. Proprietary technology.• Electric pulses evenly distributed.• Pain relief. Soothing effect.• A set of 4• Retail packagingSkin applicable areas: neck and shoulders, back, waist, arms and legs, joints and ankles. A set of four, perfect for the Prospera PL029, PL009 Tens Electronic Pulse Massager and DL003 Tens Socks Combo. Compact, lightweight, easy to carry and use. Full retail packaging.Product Specifications• Fda approved• A set of four• Wire is trademark protected• Comes with full retail packaging• Dimension 3""x1.5""