A beard trimmer is an electrical handheld gadget used to cut a man's beard to some length without the use of scissors. It has multiple length settings and consists of several collections of thin steel blades . The blades have been piled up on top of each other and oscillate once that the trimmer is turned on. The oscillation leads to the teeth to periodically overlap. A Best beard trimmer may cut any hair that it comes in contact with. It typically comes with a plastic guard or an attachment that you need to snap onto the blades to protect it from touching your face.