The Garmin Forerunner 305 GPS System combines form and function. This combination running partner and personal trainer is designed for athletes of all levels. It features a high-sensitivity GPS receiver, new courses feature, and robust ANT wireless heart rate monitor for optimal performance. The super-sensitive GPS tracks your every move, even working on tree-covered trails and near tall buildings. The heart device monitors your heart rate, speed, distance, pace and calories burned so you can train smarter, more effectively. These taskmasters will continually push you to do your personal best. Courses feature lets you download recorded courses and compete against previous workouts Auto Pause pauses and resumes training timer GPS features - GPS with high-Sensitivity SiRFstarIII architecture Wireless communication between system devices via ANT protocol Display Size(WxH) - 1.3 x 0.8 (33 x 20.3 mm) Lap Memory - 1,000 laps Rechargeable internal lithium ion battery - lasts 10 hours (typical use) Waterproof - Submersible in one meter of water for up to 30 mins. Alerts - Time, distance, pace and heart rate Physical Size(WxHxD) - 2.1 x. 7 x 2.7 (53.3 x 17.8 x 68.6 mm) Weight - 2.72 oz. (77 g)

Heart rate monitor features - Transmission Range - approximately 3m (9.8ft) 3V CR2032 battery - lasts 3 years (1 hour per day) Physical size(WxHxD) - 13.7 x 1.4 x 0.5 (348 x 35.6 x 12.7 mm) Weight -. 74 oz (21 grams) ....read more