Purpose a) It is mainly used in mouth, also can be used for the examine of ear nose and throat main characteristics. b) The stainless steel camera lens can resist high temperature and dip in liquid, .they could be alternated. Usage a) Take it out from package, screw off the bottom cover of battery storehouse anticlockwise. b) Put the pile into the battery storehouse as the polarity (it will not be bright if they are in reverse). c) Turn the covers until the lamp give off bright light. d) Install the head of the LED discreteness with disinfected observational lens and make lamp-house aim at the center of the lens as much as possible in order to ensure perfect effect. 14cm*5cm*2cm.