Arkon Resources is an industry leading manufacturer and supplier of consumer product accessories for use in the car and home. Arkon mission is to develop truly innovative, high quality products backed by unmatched service and support.PRODUCT FEATURES:External Active Antenna for GPS;Magnetic receiver attaches to car for superior reception;Allows more flexible antenna placement for better reception;Required for Toshiba E740 user.This product is designed for the following devices:i.Trek CF GPS;Holux CF GPS (GM-270) / CF GPS Ultra (GM-270U)/ BT GPS (GR-230);Fortuna Pocket XTrack CF GPS / Clip-On BT GPS;Belkin BT GPS;RoyalTek BlueGPS (RBT-3000);Navman iCN 630, GPS 3450, 4400;Emtac / Socket BT GPS.For a complete compatibility list please refer to the original manufacturer's web site. View product details at Amazon