1,LED 1W portable headlight clip-on type for loupes 2,very bright ,very light 3,It is very easy ... ,CE Jd2200 Led 1w Portable Headlight Clip-on Headlight For Loupes Type :LED 1WWorking Volts:DC 3.7VColor Temperature:4300K / 6000K ... filter Jd2200 Led 1w Portable Headlight Clip-on Headlight For Loupes