Ideal for improving blood circulation of the knee joint and pain relief caused by rheumatism, rheumatoid arthritis and arthritis. Flexible for use: - At home - At work - Car charger - Travelling Multiple usage for different body parts, easy to keep wrapped at the right position you need for heat treatment. - Arm - Thigh - Knee - Calf Product features: 1. Premium fabric: The knee pad is made of a high-quality fabric, which is soft, comfortable, breathable, wear-resistant, non-stick and lint-free. 2. The knee pad can be used to keep the knees warm, alleviate wind and prevent dampness. It can also help to promote blood circulation and alleviate rheumatism, rheumatoid disease and arthritis. 3. Rapid heating: Surface temperature can reach 45ºC in approximate 20 seconds. Temperature can be easily adjusted using a thermostat. 4. Safe and easy to use: The knee pad features has a safe 5V/DC power supply and can be charged via USB or a mains converter for convenient on-the-go use. 5. Energy saving and environmentally friendly: The knee pad consumes just 1kWh in 3 months (with average usage of not more than 2 hours per day).