About Product:High power 2W single lamp using LED single lamp energy saving, high brightness, long life and high power lithium battery 2W. Elastic design: high elastic breathable headband, different type of elastic adjustment, lightweight and comfortable, portable, removable backplane. Karen: humanization design regulation Karen regulation design, lamp 0~90 degree of freedom rotation, a wide range of lighting, the use of more convenient and flexible. The strength of dual regulation: push the switch to the first and second gear, lighting function optional light intensity.