1. The massager has fully enveloping airbags (inner side and straps) to squeeze, cyclically inflate and deflate, allowing knees to enjoy air pressure relaxing massage; 2. There are built-in 20 pieces red light physiotherapy lamp beads, specific wavelength far red inner and outer bands penetrate into the knee, to relieve knee fatigue anddiscomfort; 3. Through vibration, the device can repair and massage the muscles of the knee area to relieve the pressure and let it fully relax;Three heating modes: low range: 453 (relieving knee tingling), medium range: 503 (releasing knee tingling), high grade: 55 3(Relieve walking pain). 4. Intelligent timing design: you are free to choose 15 minutes/20 minutes/25 minutes/30 minutes. 5. One-key start, screen display, wireless use, simple touch interface, can also be used by the elderly; 6. It is USB chargeable, with a built-in 2000mah lithium battery, it usually gets fully inthree hours (related to the power of the charging plug), the normal use time is five to six hours (different depending on the use mode). Rated power: 5W Rated voltage: DC 5V Timing set: 15/20/25/30minutes Heating temp: low 453, medium 503, high 553 Battery: 2000mAh Colour:White Material:plastic Package Contents: 1 x Host 1 x USB Type-C Charger Cord Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.