This e-Trex receiver introduces the next level of user-friendly operation software for the GPS user. The 12-parallel-channel receiver ensures a solid connection with the orbiting satellites for accurate readings, and an ergonomic design features convenient side-control buttons for one-handed operation. Other features include: Storage for up to 500 waypoints 10 saveable Tracklog Trails Permanent memory that saves all valuable waypoints and Tracklogs Waterproof 2''W x 4.4''H x 1.2''D Weighs less than 5.5 oz. with batteries 22-hour battery life with 2 AA batteries (not included) Garmin? e-Trex? Instructional DVD sold separately and can be found through item search at item number 38-529-430-00