Cisco-Linksys Wireless-G Compact Flash Card WCF54G Compatible with 802.11g and 802.11b (2.4 GHz) standards Compatible with Microsoft Windows CE 3.0 or higher Operates in the 2.4 GHz frequency spectrum with throughput of up to 54 Mbps Supports up to 128-bit WEP encryption security Free technical support: 24 hours a day, 7 days a week, toll-free US calls