Linksys Wireless-N ADSL2+ Gateway. DSL connection type: ADSL, DSL specification: Annex A. Antenna gain level (max): 2 dBi. Firewall security: SPI, VPN support: IPSec, PPTP, L2TP. Certification: FCC, CE, IC-03, Wi-Fi, A-Tick, Telepermit, IDA. Operating temperature range (T-T): 0 - 40 °C, Storage temperature range (T-T): -20 - 70 °C, Operating relative humidity range: 10 - 85 %