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Why magnifying mirror is dangerous under the sun? All magnifying mirror has a focusing point. When light rays is concentrated in one spot it will burn wood or paper. Becareful when you have a magnifying mirror near a window. 
How to check a magnifying mirror? Many of the mirrors are distorted. If the refection of distance object is bended, the mirror is distorted. 
How long does the battery mirror last? Battery will not last long but with auto off function, battery can last for a long time. 
What is auto off function? Auto off function is a self timer, when a certain time is passed, the back lighting will be turned off. 
What if I use long hours every day, many batteries are needed? AC adaptor can be used with the battery mirrors. Power can be supplied from main AC supply. 
Why do you use back lighting for the mirror? You have to try it and see the difference. The image is well lit.  
Showing 6 items