9-Port Gigabit Switch (Unmanaged) Layer 2 Hardened Ethernet switch MAC auto study and aging, MAC address list capacity is 4K Conform IEEE802.3, IEEE802.3u, IEEE802.3ab/z and IEEE802.3X standards Adopts metal structure Industrial wide working temperature design: -30C~+65C High protection grade, supports common mode 4KV, differential mode 2KV Supports dual power backup