... System can convert electric energy into strong blue light. The cool blue light activates the dental whitening gel and oxidizes ... at a time. Specification:1. Wavelength: 410nm-520nm2. Light resource: 6pcs large power LED light tube3. Emission time: 1m, 2m, 3m, 5m, ... . Output power: 12V DC, 2.2A8. Whats included: Cool Light System, Main Poles, Transformer , Machine Base Instruction Manual, Mouthguard, ...