?INDUSTRIAL DESIGN?- Wave metal shell & fanless design ensure better heat dissipation and noiseless operation. Support DIN rail mount. Wide working temperature (-40? to +75? or -40°F to +167 °F). 6KV surge immunity and 8KV ESD protection. Suitable for harsh environments such as factory, refinery and traffic light control box. ?REDUNDANT POWER? - The Managed POE Switch supports dual DC 48~57V power supplies, one of which is used as a redundant power supply. (Power Supply sold separately: B015C9ITSS). ?POE WATCHDOG?- Realtime monitoring PoE load device's status and will automatically reboot PoE port when the connected device is not active. It proivdes non-stop running of PoE device, like security camera, IP speakers and IP phones. ?Q-PoE AND P-PoE?- Supports Q-PoE (Quick PoE) technology, which enables PoE power supply immediately upon switch startup without waiting for switch system software control. Support P-PoE (Perpetual PoE) technology, which enables PoE power supply without interruption when switch is restarting and restores network quickly. ?RS485 SERIAL DATA INPUT? - Provides RS485 serial port for IoT sensors integration or remote control, for example, humidity sensor, smoking sensor, light control, etc. ?4 BT90W PORTS ?-The 1~4 ports complying with IEEE802.3af/at/bt POE++ standards, deliver up to 90W power per port, suitable for high-power POE devices, like POE monitor, POE lighting, PTZ camera, etc. The 5~8 ports support the IEEE802.3af/at POE+ standards, deliver up to 30W (PoE+) power per port. The total POE budget is 360W. ?LAYER 2 MANAGED PoE SWITCH ?-Providing 8*10/100/1000Base-T Ethernet PoE ports and 2*1000Base-X SFP Ports (1G/2.5G, Fiber module is not included). Supports L2 management functions like VLAN, QoS, PoE Management and PoE control(PoE power monitoring, turn On/Off PoE). It can be managed via WEB, CLI or SNMP.