1、Functions: Multi-function knee massager can relieve joint pain, arthritis, cramps and meniscus pain. And you can also use it on your arm joint or other painful place. 2、3 Adjustable Heat: There is a Heating button to adjust the temperature in H1, H2, H3, HF(Low, Medium, High, Off). 3、3 Optional Patterns: You can choose the massage pattern with the Pattern button, 3 patterns to choose, P1 vibration, air pressure and heating at the same time; P2 vibration and P3 air pressure. 4、3 Optional Intensity: Short press the Intensity button to adjust the knee massgaer intensity in L1, L2 and L3 (Weak, Medium, Strong), you can choose the suitable one as your needs. 5、Time: Press the Time button, 15/20/25/30 minutes can be selected, the massager will automatically shut down in the selected time. 6、Red Light: Built-in 20 red physiotherapy lights, you can choose massage with red light according to your needs. Features: Functions: Multi-function knee massager can relieve joint pain, arthritis, cramps and meniscus pain. And you can also use it on your arm joint or other painful place. 3 Adjustable Heat: There is a Heating button to adjust the temperature in H1, H2, H3, HF(Low, Medium, High, Off). 3 Optional Patterns: You can choose the massage pattern with the Pattern button, 3 patterns to choose, P1 vibration, air pressure and heating at the same time; P2 vibration and P3 air pressure. 3 Optional Intensity: Short press the Intensity button to adjust the knee massgaer intensity in L1, L2 and L3 (Weak, Medium, Strong), you can choose the suitable one as your needs. Time: Press the Time button, 15/20/25/30 minutes can be selected, the massager will automatically shut down in the selected time. Red Light: Built-in 20 red physiotherapy lights, you can choose massage with red light according to your needs. Specifications: Material: PC Color: White Built-in Battery: 5V 1800mAh Built-in Lithium Battery Item Size: 25 * 16 * 12cm / 9.8 * 6.3 * 4.7in Item Weight: 595g / 1.3lb Package Size: 27.5 * 20 * 12.5cm / 10.8 * 7.9 * 4.9in Package Weight: 808g / 1.8lb Package List: 1 * Knee Massager 1 * USB Cable 1 * User Manual 1 * Knee Massager 1 * USB Cable 1 * User Manual