Buyers should prioritize NTC intelligent temperature control to prevent overheating and ensure user safety. Look for products featuring Graphene heating technology, which provides rapid heating (within 3-5 seconds) and Far-infrared (FIR) emission for deep tissue penetration. The device should offer at least 3-5 vibration massage modes and adjustable heat settings (typically 45°C, 55°C, and 65°C). Additionally, ensure the battery capacity is at least 1800mAh to 2500mAh to support 2-4 hours of continuous use, and verify the use of skin-friendly fabrics like soft velvet or Lycra.