Very happy with this purchase from Kinreen . it is exactly what I expected. It comes well packaged. I am impressed with the quality of this product and love that it comes with rechargeable batteries ! There is also a timer on the light , so you know about how long you need to use it . The light is very strong , it gets warm but not too hot .I found it works great on my joint pain , especially on my knees and hands . It also helped to relax my stiff sore muscles in some areas . I’m really glad I took the chance and bought this item.
Portable red light device is made of red 630nm 660nm and near infrared 850nm . It sales very hot on Amazon , and Kinreen is the original manufacturer.