An electric trimmer/shaver is a personal grooming device that uses a small electric motor to power blades for cutting hair on your face, head, body, nose, or ears. It’s similar in purpose to a traditional razor, but uses motor-driven blades to trim or shave without soap or water (dry shave). 
These devices often combine multiple tools in one — such as a beard trimmer, hair clipper, nasal trimmer, and shaver — for all-in-one grooming. 
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Battery: What “600 mA” Means (Capacity)
When a trimmer/shaver is described with “600 mA”, it typically refers to the battery capacity measured in milliampere-hours (mAh) — for example, 600 mAh. Here’s what that means: