Philips Norelco Beard Trimmer and Hair Clipper - cordless grooming, rechargeable, adjustable length, beard trimmer and hair clipper - No blade oil needed - BT3210/41 The Philips Norelco Beard Trimmer and hair clipper features Dual Cut blades, for a fast and even trim. Spin the zoom wheel to lock in length settings at 3/64"(1mm) increments. Powered by a Lithium Ion battery for 90 minutes of cordless use.