3 speeds are freely adjustable, long press for 3 seconds on/off, short press to switch temperature. Blue low temperature (temperature 40 ° C ± 5 ° C) / white light medium temperature (temperature 50 ° C ± 5 ° C) / red light high (temperature 60 ° C ± 5 ° C) - Fast heating in the far infrared to remove the dampness. - The heating wire is hot. The temperature can reach 45-65 °C. - Infrared heat, no harmful radiation. - Hand washable or machine washable. Remove the battery and use the insulation to drain the power connector - Two bifurcate straps design, hook and loop closure, the heating pad can wrap around and be locked at any leg or arm positions where you need heat compress, you needn't hold it by hand any more. - Wide range of applications, providing ultra-comfortable hyperthermia for knee arthritis to relieve pain