DETAILSFeatures: 3-in-1 Portable Air Compression Knee Massager Ergonomically Design with Comfort and Proper Fit Customizable and Comfortable Wrap-Around and Adjustable Straps Long-term Usage of Built-in Rechargeable Battery Suitable for Various Activities Compact and Lightweight 4 Vibration Modes and 2 Heat Temperature Modes Customizable Vibration Frequency and Heating Temperature Settings Provide Relaxation to Joints, Relieve Pain and Improve Circulation Easy to Operate and Safe to Use 20 Minutes Automatic Shutdown Function LCD Touchable Display Control Function NTC Temperature Control, 5 Safe Heat Up Function Control Discomfort or Overheating while in Use Magnetic Battery Compartment 1 N20 Motors Inside that Massage the Muscle and Arthrosis What's in the Box: Air Compression Knee Massager USB Cable PE Bag Technical Specs: Construction Materials: Linen Gray Health Cloth Heating Function Max to 53° Celsius Input: 5V 1A USB Cable Charger Battery mAh: 2000mAH Li-Batteries Battery Composition: Lithium Cobalt Oxide, Graphite, Copper Foil, Aluminum Foil, Others Battery Type: Lithium Battery Battery Volts: 3.7V Watt Hours (Wh): 7.4Wh Battery Weight: 45.8g Battery Unit: 1 Number of Li-ion Cells: 1 Lithium Battery Packaging: Cylinder Product Dimensions (L x W x H): 4.7 x 4.7 x 3.9 -inches What's In The BoxWhat's in the Box: Air Compression Knee Massager USB Cable PE Bag MANUALS & DOWNLOADS SLKNMSG14 - Manuals