2.6" sunlight-readable color screen; 160 x 240 pixels; Water-resistant (IPX7); High-sensitivity GPS & GLONASS receiver with quad helix antenna; Built-in worldwide basemap with shaded relief; 4GB of internal memory & microSD(TM) Card slot to add more maps; 250,000 preloaded caches for paperless caching from Geocaching.com; High-speed USB & NMEA 0183 compatible; Compatible with optional, subscription-based BirdsEye Satellite Imagery, free Garmin(R) Custom Maps that puts paper maps on the GPSMAP(R) 64 device & Garmin Connect(TM); Works with BaseCamp(TM) software to view & organize maps, waypoints, routes & tracks; Up to 16 hours battery life; Requires 2 AA batteries, NiMH or lithium recommended; Includes lanyard & USB cable;