TRENDnet 54Mbps Wireless G PC Card TEW-421PC Wi-Fi Compliant with IEEE 802.11g and IEEE 802.11b Standards Uses 2.4 GHz Frequency Band, which Complies with Worldwide Requirements Supports Ad-Hoc (Peer-to-Peer) Mode or Infrastructure (AP-Client) Mode Dynamic Data Rate Scaling at 54, 48, 36, 24, 18, 12, 9 and 6Mbps for 802.11g. Compatible with Windows 98(SE)/ME/2000/XP 3 YEAR WARRANTY & TOLL-FREE TECH SUPPORT- TRENDnet backs this product with a 3 year manufacturer warranty as well as toll-free tech support.