When evaluating grooming sets, prioritize stainless steel blades (preferably 440C or Japanese steel) for durability and corrosion resistance. For electric components, ensure the motor reaches at least 6,000 to 7,000 RPM to prevent hair pulling. Battery life is critical; look for Lithium-ion batteries providing at least 90-120 minutes of cordless runtime with a USB quick-charge feature. Additionally, verify the IPX7 waterproof rating if the set is intended for wet/dry use or easy cleaning under running water.