Buyers must first identify the communication protocol required: Wi-Fi (2.4GHz) for standalone use, or Zigbee/Bluetooth Mesh which requires a gateway but offers higher stability for large-scale installations. Additionally, verify the wiring requirement, specifically whether the installation site has a Neutral Wire; if not, you must source 'No Neutral' versions which typically require a capacitor. Ensure the load capacity (e.g., 10A or 16A) matches the intended appliances to prevent circuit failure.