Manufacturer's Description: "The TQ Solo™ is the only hand held portable device with exclusive Multi Radiance Technology™. Multi Radiance Technology™ synergistically incorporates 4 proven radiances, providing the ultimate phototherapy environment for relieving pain: super pulsed laser, infrared light, red light, and static magnetic field. With up to 18 hours of battery power, the TQ Solo’s™ pain relieving power is there when you need it."