Ubiquiti Protect G4 Doorbell UVC-g4-doorbell. Ubiquiti Wi-Fi doorbell. UniFi Protect G4 Doorbell is a Wi-Fi video doorbell with a built-in display and real-time two-way audio communication. The camera features a high-quality 5MP sensor with enhanced night vision. Image streams can be viewed in up to 1600x1200 (2MP) HD at 30 FPS. UniFi Protect G4 Doorbell includes a PIR sensor for instant motion detection alerts. Integration with UniFi Protect provides an easy-to-use interface.