ZyXEL P-335 Firewall Router w/ USB Print Server. Networking standards: IEEE 802.3, IEEE 802.3u. Firewall security: SPI, DoS. Flash memory: 4 MB, Internal memory: 16 MB. Operating temperature range (T-T): 0 - 50 °C, Storage temperature range (T-T): -30 - 60 °C, Operating relative humidity range: 20 - 95 %. Weight: 0.381 kg