The StreetPilot c340 provides in-car navigation that is simple for anyone to use directly out of the box. After selecting a destination from the user-friendly touch screen interface, Garmins text-to-speech feature tells users the name of the street, when to turn, and in what direction. If you miss your turn, the c340 automatically calculates a new route to the destination. By Garmin. WAAS-enabled 12 parallel channel GPS Built-in patch antenna; MCX-type connector for optional external GPS antenna connection Preloaded with detailed U.S., Canada & Puerto Rico maps and SD memory card expansion slot for use with other MapSource street-mapping products Traffic alerts with optional GTM 10 FM TMC traffic receiver Audible and visual navigation instructions and warnings Users can set up proximity alerts for school zones, safety cameras, and more with Garmins POI loader program Choose between a three-dimensional mapping perspective or 2D overhead view Display: 2.8"W x 2.1"H (3.5" diag.), 320 x 240 pixels; bright, TFT display, 64K colors, with white backlight and touch screen Weights 9.4 ounces and measures 4.4" W x 3.2" H x 2.8" D Built-in lithium ion battery for trip planning (approximately 4-8 hours battery life) Package includes: StreetPilot c340 receiver with built-in antenna, dual internal speaker system for voice guidance and alerts, vehicle suction cup mount with 12-24 volt adapter, dashboard disk, USB interface cable, preloaded with City Select North America NT, quick-reference guide