4 AI (analog input 4~20mA) detectors, customize threshold definitions 4 on-board zones 3 RS485 detectors 1 RS232 detector 1 ITU-Bus, support up to 64 temperature probes (detectors) 1 IR control, connect with air conditioner remote control 2 channel relay output 2 channel@1080P IPC 1 Ethernet ports Support 4G (-F only) Local storage, 32GB memory Support 1×2.5-inch HDD, up to4TB Web configuration, alarm and video review Optional power supply DC 12V / DC -48V / DC 8~48V td {border: 1.0px solid #cccccc;} br {mso-data-placement: same-cell;} HDD Brand Dahua SKU 100220855_NP-1020473907 Model 4TB