it's recommended to add a towel while directly contacting the skin. heat function can be turned on/off to your preference. iKristin electric massager with ergonomic design is the perfect fit for various body parts such as neck, shoulder, back, waist, thigh and calf. a good quality motor and 16 deep kneading acupressure 4d rolling balls for muscle relaxation. suitable for most people to reduce pain and aches, loosen stiff muscles, reduces stress and finally saves your money and time 2 in 1 design: built in double machine core which allows you to have kneading and knocking massage in 1 massager. 2 knocking nodes featured with rubber tip, combine 14 kneading nodes delivering soft and soothe massage experience. breathable mesh fabric&pu leather: premium breathable mesh fabrics with evenly spread holes help delivery heat and massage intensity. deluxe pu leather is soft to touch and easy to clean, we use it on iKristin back massagers to elevate your massage experience. ergonomic u shape design with hand hangers ergonomic u shape design allows you to put it on your shoulder and back easier.and featured with 2 hand hangers, you can get more kneading intensity by pulling the hangers. package includes 1electric back massager 1home ac adapter 1vehicular power cord