The Forerunner 305 combines all of the popular features found in the 301 along with a high-sensitivity GPS receiver, new courses feature, and robust wireless heart rate monitor for optimal performance. The Forerunner 305 keeps you on track with innovative features including: New! Sleek, stylish, lightweight design that "wraps" the GPS antenna around part of the wrist for a better view of the sky, improving reception during training New! High-sensitivity GPS receiver provides faster acquisition times and improves tracking under trees and near tall buildings New! Robust wireless heart rate monitor with softer, more comfortable chest strap eliminates cross-talk with other devices and helps you train in your zone New! Customizable screens let you view up to 12 data fields on 3 data screens for immediate feedback on the information you need most when training Multi-sport™ capability lets you seamlessly transition between sports without resetting the unit, so you can use it for running, biking, and more Easy to use — no calibration required. Just turn it on and go Customize your Forerunner 305 to get the most out of your training. To help you achieve your personal best, the Forerunner 305 includes the following smart features: New! Courses feature lets you download recorded courses and compete against previous workouts Auto Pause® pauses and resumes training timer based on a specified speed so you never have to start or stop the timer Auto Lap® records lap data when you reach a specified time, distance or position so you never have to punch the lap button Virtual Partner™ lets you train against a digital person at specified time, distance or pace goals AutoScroll™ cycles through data pages during a workout Package Includes: Forerunner® 305 Heart rate monitor Training Center CD Docking cradle Expander strap A/C charger PC/USB interface cable Quick start guide Owner's manual