The TQ Solo is a safe high-power pulsing cold laser with state-of-the-art multi-frequency emitters in a compact rechargable portable unit.The TQ Solo utilizes 3 proven wavelengths to give your body both deep and shallow penetration for maximum healing effect. The TQ Solo combines 3 proven technologies into one device: A pulsed 15,000 mW (15 watt @ 905 nm) laser A 60 mW (875 nm) infrared light A 7.5 mW (660 nm) red lightAdministering effective light therapy is simple with three preset frequencies and an easy to use pictorial setup guide (see below). Although this device is used on doctor's offices around the world, it can be purchased for home use.The TQ Solo is compact and lightweight. The rechargeable lithium battery lasts up to 18 hours so pain relief is always there when you need it!