Tired hands? This little guy knows how to help: rhythmic air cushions on top and bottom hug your fingers, palms, and wrists, kneading acupressure points with four massage heads. Warmth from 95–104 °F penetrates to the bone, easing stiffness and restoring flexibility. Three modes, three intensity levels, dual heating, plus a built-in 2500 mAh battery that lasts up to 5 hours