Overall * 2.38 inch big screen (3.4 cm x 5 cm). * Built-in antenna. (SiRF Star II). * 12 parallel channels. * IPX7 level waterproof. * Size: 120 * 54 * 30 mm; Weight: 170 gram. * Low power consumption with 2 AA batteries. * Map Datum: more than 100, total is 115 datum. * 160 x 105 pixel, high contrast LCD, EL backlighting. * Support RS-232 interface and long distance modem data transform. Storage Ability: * 1000 waypoints with name and symbol. * 30 reversible routes with up to 50 waypoints each. * 10 tracks with name and symbol.