Cordless & Rechargeable: The hand held massager is powered by rechargeable lithium-ion battery. No need to plug in while in use. It’s compact, cordless that allows you to massage anywhere on-the-go. You can enjoy the massage at home, office, or car, airplane and on the long trip, etc. anywhere & anytime. (The battery can lasts for approx. 80mins on a full charge, and it is safe to use while charging) Percussion Massager: The massagers for neck and back is built in powerful vibration motor that can produce a very good deep tissue percussion massage. It relieves muscle by putting mild pressure on the knots and sore muscles which brings relaxation through out the body. Heat Therapy: The back massager has a heated massage feature,sooth away the body daily in the comfort of your own home at any time using the heat,infrared light. It will spread warmth on the body to effectively relax tension and knots that built up in your muscles throughout the day. Versatile Uses: The massager with heat features 4 interchangeable massage heads, 3 automatic massage modes and 3 adjustable speed settings, allowing you to customize and modify each massage stage to your liking. It provides a soothing massage for every part of the body and can be applied to the neck, shoulders, back, waist, arms, legs, feet, etc. to relieve muscle tension, soreness.