? ?Safety & 30 Day Money Back Guarantee?- Built-in thermal protection module. Once it is overheat, the vibration heating knee pad would stop until the heat return to standard temperature, so it is 100% safe to use. We know you will be impressed with our product and quality service, but if you have any questions or concerns, please feel free to contact us. ? ?Where to Use?- This massage heat knee wrap is used to relieve muscular aches and joint pains associated with overexertion, strains and sprains as well as pains associated with arthritis, meniscus, osteoarthritis, bursitis, ACL PCL MCL tear etc. Also perfect for outdoor campaign, such as motor cycle, etc. ? ?Adjustable & Easy to Use? - Reinforced stabilizer ensures the knee cap remains in its proper position, the heating pad can wrap around and be locked at any knee or extend to Thigh/Calf positions where you need heat compress. Perfect as birthday gifts, thanksgiving and Christmas gifts. ? ?Perfect Combination of Massaging & Heating?- 5 heat & 5 vibrating setting. Vibration combined with hot therapy offers complete pain relief & relaxation to muscles and reduces stress, helps accelerate recovery from injuries while delivering targeted relief from pain for either Knee. Heat & Massage mode can work together or work separately. 7.4V Powerful Rechargeable Lipo Battery Offers Unmatched Power?- Almost all heating vibration knee wraps in the market are powered by 5V batteries, while we use 7.4V battery, which offers unmatched power to the heating message knee pad.