Polar RS800G3 Multisport GPS Computer Heart Rate Monitor Watch with FREE USB 2.0 Interface Multisport training system with wristwatch computer, GPS sensor and FREE USB 2.0 Interface Lets athletes track speed and distance in variety of active pursuits Highly accurate wireless heart rate gauge, interval trainer, and more Lightweight, water-resistant GPS sensor talks wirelessly to wristwatch ProTrainer 5 software for uploading up to 21 planned training sessions