The practical aid when you need your hands for other things 28 very bright leds will light up your way or your workplace adjustable head band led life up to approx 100 000 hours 4 kinds of lighting 1 led 9 leds 28 leds flashing brightness 11 000 13 000 mcd angle of light 15 lighting range 20 m powered by 3 x micro aaa batteries supplied