The Therapist Select PAQ-30H Quad-Action percussion massager with infrared heat let's you say goodbye to knots and is ideal for pre and post work outs or after long days at the office. Like the steady beat of a drum, percussion action massage chips away at pent up muscle tension. The double dual-cam action for smooth yet powerful performance begins with a percussion first, 4 massage heads! At up to 6,200 pulses per minute, the quad heads really relieve tension and the soothing infrared heat helps create a deep tissue massage for penetrating relief. The comfort gel grip hand held design allows for targeted relief to most muscle groups- back, shoulders, quads, hamstrings, calves and more.