There is a switch on the back of the electric razor. Push it up. A jagged object will pop out. What's that?
The serrated part of the projectile is a hair trimmer.
Now some of the advanced electric shaver trimmer with small, mainly for small corrections for long hair or temples, expand the scope of use of electric shaver. This member is equivalent to a small electric hair clipper, only its power is much smaller, only a slight and small range pruning.
