The Edge 305 has the ability to measure heart rate, speed, distance, time, calories burned, altitude, climb and descent, plus much more. 305 features include: Highly efficient ANT wireless protocol provides superior battery life and reliably transfers your performance data to the Edge 305 Easy-to-install-no calibration required. Just snap it in the included bike mount and go High-sensitivity GPS receiver-knows your position even in tree cover and canyons, making it extremely reliable for navigation Customisable cycle computer-shows up to eight different data fields for continuous feedback Take your ride to the next level with the Edge 305 - Garmin s GPS-enabled, personal trainer and cycle computer. From competitive road racing to mountain biking, the cyclist-friendly, lightweight Edge will help you achieve your personal best. With the easy-to-use Edge 305 on your bike, you ll always know where you re going and how far you ve gone. For advanced cyclists, the Edge 305 comes packaged with a heart rate monitor to provide valuable feedback. In addition, the Edge 305 incorporates a barometric altimeter for extremely accurate elevation and vertical profile data. Virtual Partner- lets you ''race'' a virtual competitor, making training fun Courses-lets you ''race'' against a recorded course to try to match previously set speeds at every point along the way Auto Pause- pauses the training timer when you slow down below a specified speed and resumes when you speed up again so you can focus on your ride Auto Lap - automatically triggers a lap every time you pass a specified location or travel a preset distance Training Center Software-gives you the ability to create workouts, manage and download courses, and create a detailed post-ride analysis that charts your performance Take your ride to the next level with the Edge 305 - Garmin s GPS-enabled, personal trainer and cycle computer. From competitive road racing to mountain biking, the cyclist-friendly, lightweight Edge will help you achieve your personal best. With the easy-to-use Edge 305 on your bike, you ll always know where you re going and how far you ve gone. For advanced cyclists, the Edge 305 comes packaged with a heart rate monitor to provide valuable feedback. In addition, the Edge 305 incorporates a barometric altimeter for extremely accurate elevation and vertical profile data. Contents: Edge 305 with heart rate monitor Bike mount Garmin Training Center CD A/C charger USB PC interface cable Quick reference guide Owners manual