Monitor Emphasizes Form Factor, Feature Set & Gps Sensitivity. Includes Highly Sensitive Gps Receiver For Accurate Data. Sirf-stariii Receiver For Great Reception In Challenging Conditions. Lightweight & Water Proof. Monitors Vertical Profiles, Climb & Descent, Altitude, Speed, Distance & Time. Gps Based Conveinent For Course Maps Which Include Hills & Curves. Mount On The Stem Or Handlebars & Include Routing Capability & Advanced Workout. Measures Pedaling Cadence & Heart Rate Data. Includes A Barometric Sensor. Pc-based Training Center Software Allows User To Create Workout Or Use Workout Templates & Download To Unit. Sensor Data Transmits Via Wireless Communications. Training Center Also Allows User To Chart Workout Performance. Geared Toward Advanced Cycling. Compatible With The Heart Rate & Speed/cadence Sensors.