Motor Type (The "Heart"):
Rotary Motors: The most versatile and powerful.
Magnetic Motors: High speed, best for quick, thin-to-medium hair cuts.
Pivot Motors: High torque, lower speed.
Blade Material:
Stainless Steel: The reliable, cost-effective standard.
Ceramic: Stays cooler to the touch (great for sensitive skin) and keeps a sharp edge, but is fragile if dropped.
Titanium-Coated: The premium, luxury choice.
Power/Battery:
Lithium-Ion (Li-Ion): The industry standard for cordless models.
Corded: Offers unlimited runtime—essential for high-volume barbershops where charging downtime is not an option.
Precision/RPM: Professional-grade models typically range from 6,000 to 10,000+ RPM (or strokes per minute) for a smooth, snag-free cut.