Nikon WT-4A Wireless Transmitter for Nikon D700, D3 and D300 DSLR Cameras Transmission Range - Transmission range when wireless LAN is used is approx. 590 feet or 850 feet. (Varies according to transmission conditions.) Power Requirements - - EN-EL3e battery (sold separately) and MH-18a charger for EN-EL3e battery or AC Adapter EH-6 (sold separately) WiFi Support - Supports wireless LAN conforming to IEEE 802.11b/g, IEEE 802.11a, and wired LAN conforming to IEEE 802.3u and IEEE 802.3 (10BASE-T)