12W Class IV Cold Laser Therapy Device 808nm 905nm MLS Pain Relief Physiotherapy. Both wavelengths are invisible to the human eye during operation. 【 12W Dual-Wavelength Photobiomodulation System 】. The 808nm wavelength is designed for soft tissue, skin, muscle, nerve, and recovery-related applications, helping support circulation, reduce swelling, maintain tissue flexibility, and promote wound recovery.