Breo ipalm520 acupressure hand massager with heat compression. Intelligent air pressure, point massage, heat compression. Massages the pressure points around the palms and fingers. The iPalm520 employs acupressure/reflexology massage, a type of massage that might not be familiar for many of us. The iPalm520 has various massage functions, including a feature that controls massage strength. If the lowest air pressure setting is too strong, make use of the air pressure release valve or button which would be helpful.Heat compression is low 35 - 38 in Celsius and high 39 - 42 in Celsius. The maximum hand size should be 10 x 4.5 x 2 inches