What are the basic functions a hair clipper should have?
Adjustable cutting lengths, interchangeable heads, self-cleaning or easy-to-use blades, and the ability to use either corded or cordless. Also check for a waterproof design if you want easy cleaning.
How often should I clean and maintain the clipper?
Clean the blades after each use to remove hair and prevent dirt build-up. Oil the blades regularly to keep them sharp and follow the manufacturer's instructions for maintenance.