?Great Gift & 3-Year Warranty? The knee heating pads with massager can relax your full leg by heating and vibrating massage. This knee massager for knee pain relief is really a great gift choice for your whole family! And we support 30-Days Money Back Guarantee for Any Reason & 3-Years Warranty for Quality-Related Issues! If you are not fully satisfied, just contact us, we will try our best to satisfy you fully!. ?Adjustable Velcro & Smart Timer? This heated knee brace has adjustable velcro straps to ensure it can fit different knee sizes, it fits US people with a knee circumference of 10-26 inches! So, most US people can use it! Also, this leg massager for pain relief has a 20 mins smart timer, which can shut off after 20 mins automatically, it allows the user to use it when sleeping, without worrying about overheating. ?3 Vibration Modes & 3 Heat Levels? This knee massager with heat comes with 3 vibration modes(Wave/Continuous/Pulse), 3 heating levels(149?/130?/110?). The vibration and heating functions are individual and optional, they can work simultaneously or separately. Moreover, different modes and levels have different light colors(Red/Yellow/Green), which are easy to distinguish and use even for the elderly!. ?AC Adapter Provides More Heat & Massage? This comes with a 12V AC adapter, No Battery! Compared with the battery-operated ones, they can't provide enough heat due to the low battery voltage, the max heat is only 110?; But our corded ones can provide more heat thanks to the 12V safe voltage, the max heat is 149?. Also, any battery has a limited life, so the battery-operated ones will be useless once the battery life is up. But our ones will not be affected by the battery life, last longer!. ?Helps Knee Pain Relief & Circulation? This knee massager for knee pain relief comes with 2 composite fiber heating wires. Compared with the other cheap heating wires, our ones can produce deeper heat penetration, through the skin to fix your knee pains. It has 2*2 effective vibrations motors, that can deliver a soothing massage to deep tissue muscles. So this heating pad for knee can help relieve further muscle tension, arthritic, joint swelling, knee cold, etc.