Garmin Foretrex 401 Waterproof Hiking GPS Features high-sensitivity GPS receiver with HotFix for improved performance and reception in heavy tree cover or deep canyons Keeps track of routes, tracks and waypoints, and heart rate with add on heart rate monitor (sold separate). Uses standard AAA batteries. 2 required. TracBack feature retraces user's path on the easy-to-read LCD display;Display resolution	100 x 64 pixels;Battery life	Up to 17 hours in GPS mode;Track Log 10000. Display size : 1.42 x 0.91 inches Supports dual position readout so user can view current location in multiple formats. Audible tones. Hold the compass level when navigating to ensure maximum accuracy Features trip computer, sunrise/sunset times, hunting/fishing information, electronic compass and barometric altimeter