Heating And Vibration FunctionThese knee pads have 3 heating levels.They are low-temperature grade, medium-temperature grade, and high-temperature grade.Low - Temperature Level 40/105;Medium-Temperature Level 45/115;High - Temperature Level 50/125The heat is evenly distributed and covers the entire joint area..It also has 3 vibration modes: weak-L1, medium-L2 and strong-L3. Unique DesignThis knee massager is ergonomically designed with Velcro to adjust the size and position of the wrapping area.There are also several airbags inside the product to squeeze the massage. knee massager can be used not only on the knees but also on the arms, thighs, knees, calves and ankles.The Velcro design allows this knee brace to fit your area better. Multi-Function ModeThis knee massager is equipped with airbags on both sides.The strength of the knee massager can also be adjusted according to the pressure applied.There is also a timer function that helps you turn off the device automatically. It also can enhance the relaxation during the massage process, so that the knees can get an all-around soothing massage. Easy to OperateThis knee brace has a clearly visible LED display. Allows the user to clearly see the function buttons on the screen. There are buttons on the screen for function change, just click the button to change the mode and function.It also comes with a user manual with clear illustrations to help you understand how to use the product. Convenient ProductsThis product is designed to be very lightweight.A must-have product for traveling, it won't waste too much space in your suitcase.This product can be carried anywhere. It is also an ideal gift for friends and family. Specifications: Material: ABS Battery capacity: 2000mA Charging voltage: 5V/2A Charging interface: Tyep-c USB Charging time: approximately 4-5 hours Battery life: approximately 4-5 hours Temperature range: low temperature 40, medium temperature 45, high temperature 50 Massage methods: vibration massage, airbag compression, hot compress to warm the knees, and red light therapy Product size: 20.5 * 15.5 * 17.5cm