Preloaded detailed Us, Canada & Puerto Rico maps. SD memory card expansion slot for use w/ other MapSource® street-mapping products. Text-to-Speech unit prompts. Audible & visual navigation instructions & warnings. Set up proximity alerts for school zones, safety cameras. Choice of 3D mapping perspective or 2D overhead view. Display:2.8"Wx2.1"H, w/ white backlight & touch screen. Unit dimensions: 4.4"Wx3.2"Hx2.8"D. Built-in lithium battery for trip planning (4-8 hours battery life). Includes integrated suction-cup mounting system provides easy adjustment & quick release. USB interface. Wt. 9.4 oz.