How to Compare Rechargeable Products

Charging method

Magnetic contacts allow a fully sealed body and are the norm in waterproof designs, but use a proprietary cable. Covered USB ports use common cables but compromise sealing. Neither is wrong; it depends on whether bath use or cable convenience matters more to you.

Run time and charge time

Manufacturers publish run time at a stated setting and charge time from empty. Treat both as approximate and compare them across products at face value. A product that runs for an hour and charges in two is typical; large deviations either way are worth noticing.

Controls, locks and noise

Look for a travel lock, a clear indication of the button sequence, and a description of noise. “Whisper-quiet” means quiet against the body. Independent controls matter on products with two motors. Large tactile buttons help anyone with limited dexterity.

Warranty and support

Premium-tier products often carry a stated warranty of a year or more; check it on the listing and the manufacturer's site. This book does not track warranties or availability, and the product page is the authority at the time of purchase.

• Charging method and cable
• Stated run time and charge time
• Travel lock
• Stated IP rating
• Warranty length