Built-in patch antenna, MCX-type connector for optional external GPS antenna connectionPreloaded with detailed U.S., Canada and Puerto Rico maps - no downloading required. SD memory card expansion slot for use with other MapSource street-mapping products. Traffic alerts with optional GTM 10 FM TMC traffic receiver. Brand: Garmin Measures: 4.4 x 2.8 x 3.2 inches (LxWxH) Connections USB Product Type-GPS Display Size 3.5"