i-gotU USB GPS Travel & Sports Logger - GT-600 Built in SiRF Star III 65nm GPS low power chipset and GPS Antenna Compact, match box size 46x41.5x14mm, light weight 76g easy to attach to anywhere Battery 750mAh, able to work for around 30 hours at default 5 second logging interval GPS Datalogger with built in 64Mb flash memory, able to store 262000 waypoints. (360 hours of data) Able to review your trip route/track with Google Maps/Google Earth and geo-tag your photo by powerful @tripPC software