From Therabody’s website: “Meet RecoveryPulse Calf, the most advanced calf sleeve on the market. Compression, vibration, and proprietary FlowKnit Fabric™ combined in one wearable. Whether you're on your feet all day, taking a long flight, or relaxing at home, experience convenient pain relief and targeted recovery wherever you are, without slowing down. Designed for a snug, comfortable fit even under clothing.” 45-minute battery life Sweat resistant Machine washable (remove battery pack before washing)” - Two available - EACH come with sleeve, chargeable battery, charging cable, operating manuel, and Therabody washing machine bag - Each are SIZE LARGE - circumference for Large 13.8”- 16.5”