The Edge 305 comes packaged with a heart rate monitor, USB cable, A/C charger, CD-ROM, bike mount and extra mount. the optional wireless pedaling cadence sensor is $60. 

A barometric altimeter is included for extremely accurate elevation and vertical profile data. 

The Edge 305 with the sped/cadence sensor has the ability to measure pedaling cadence, heart rate, speed, distance, time, calories burned, altitude, climb and descent, plus much more. 

         Garmin Edge 305 features include:

• 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
• Highly efficient ANT wireless protocol—provides superior battery life and reliably transfers your performance data to the Edge 305
• Customizable cycle computer—shows up to eight different data fields for continuous feedback
• Virtual Partner™—lets you "race" a virtual competitor, making training fun
• Courses—let 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

Heart Rate Monitor - Garmin Edge 305 with heart rate chest belt uses a robust ANT wireless technology that eliminates cross-talk and interference to reliably measure and send heart rate data to the Edge via a soft, comfortable chest strap. This data is stored with each track point for post-workout analysis.

Cadence Sensor:  Edge 305 with cadence includes a self-calibrating, wireless speed/cadence sensor so you can monitor your pedaling cadence as you ride. The speed/cadence sensor uses the same robust ANT wireless technology to reliably measure and report your pedaling strokes per minute to the Edge.

Waterproof design. Edge 305 can be used with any  bike, and attaches to either the stem or handlebars. Its  case frames an easy-to-read, backlit display that can show up to eight different data fields along with altitude and a map view.

Garmin Training Center Software:  Included Garmin Training Center software gives you the ability to overlay your ride data onto a course map. It offers interactive analysis tools that measure your speed, distance, climb, and descent against varying terrain, elevation and more. Create and schedule custom workouts or use workout templates and download to the Edge.

Analyze your data: Garmin's web-based application, MotionBased.com,  provides in-depth analysis of your workouts, online mapping, and route sharing to take your training to the next level. Endurance athletes can use the Edge with TrainingPeaks.com, an easy-to-use web-based training system designed to help athletes train for any event.

Warranty:  One year parts and labor warranty