Automatic Light Control Sensor. Charge from computer USB or charger. Antiaging Light Therapy Machine - NOVA RED. 660 nm wavelength for most effective PhotoRejuvenation, Skin Collagen and Elastin Boost. Continuous and Pulse Modes. Rechargeable Cordless Operation - Charge/Power from computer USB port or charger provided. Great Feature - Light Emission Control Sensor to protect eyes without goggles - Light will only be emitted when Light emitting head is positioned against skin - main photo is a demotrastion only and shows light emission during operation. Comes with a manual.