FULL INTEGRATION WITH SMART REOLINK CAMS: The RLN36 NVR can integrate human/vehicle detection & playback from Reolink IP cams to build an intelligent system. By adding more Reolink cameras with optical zoom, auto-tracking, two-way talk, motion-triggered spotlights features, you can even build a cutting-edge home security system on your own. UPGRADED DESIGN, FASTER DATA TRANSFER: This Reolink NVR can be plugged into mic/speaker devices to hear & talk back to whoever you catch on the monitor via Reolink cameras with two-way talk function. The RCA male-to-female converters are required (not included). The USB 3.0 port will help you back up important footage from your HDD to your portable hard drive efficiently. 3 HDD BAYS, BUSINESS-GRADE STORAGE: The RLN36 network video recorder contains three HDD bays with each supporting up to 16TB HDD (NO HDD included). With 48TB storage in total and 36 IP cameras recording 24/7 at 6Mbps, the HDDs can last around 20 days. For a list of the recommended HDDs, please refer to the FAQ/Video page for more details. EXPAND YOUR SYSTEM WITH POE SWITCHES: By connecting up to four PoE switches to the LAN ports of the NVR, you can extend your system for broader coverage and higher performance. Separating 36 cameras to 4 PoE switches, then connecting the PoE Switches to the RLN36 for integrated management, your 4K security system can be accessed with no latency with or without internet. ONLY WORK WITH REOLINK IP CAMERAS: Work perfectly with all Reolink PoE 12MP/4K/5MP/4MP cameras and Reolink WiFi cameras with DC power (Battery-powered Cams are not supported), such as RLC-1212A, RLC1224A, RLC-823A 16X, Trackmix PoE, Duo 2 PoE, 823A, 811A, 810A, 820A, 842A, 510A, 520A, Doorbell PoE, E1 Outdoor cameras. Manage up to 36 Reolink IP cameras simultaneously easily.