Comfort Use: The product made of soft fibers it is breathable while providing a comfortable experience for users. Lightweight and Portable: LED light phototherapy slippers are lightweight and does not bring any weight on the feet. 20min Automatic Shutdown: Don t worry about falling asleep and forgetting to turn it off or using it overtime! Safe to Use: No side effects and most athletes have actually tested that it works. Easy to Use: Easy to connect intuitive button operationeven for middle-aged and elderly people! Specification: Light Beads: 88pcs red lights + 88pcs IR lights Material: 75% Neoprene + 25% Velvet Wavelength: 660nm + 880nm Light Beads Craft: DIP Bulb Temperature: Max 104℉ Frequency:50/60Hz Service life: 50 000 hours + Rated power: 15W Note: If you have any quetions you can contact us! 2-7 Fast delivery Free lifetime replacement parts 1 year warranty!