The Homedics Therapist Select Hot & Cold Percussion Massager with thermal heat + cold gel attachments work together to provide deep muscle release. The thermal heat attachment warms up and loosens tight muscles, while the cold gel attachment reduces inflammation and alleviates pain. Its powerful, brushless motor provides a quiet, yet effective, high-intensity percussion massage to help activate muscles and improve recovery. A cordless design and extra-long battery life offers the ultimate convenience and portability.