Specifications: Weight and Dimensions Battery lifetime: Up to 8 hours (GPS+HR), up to 10 hours (GPS). Display size: 22x25mm. Display resolution: 144×168. Thickness: 13.8 mm. Weight: 63 grams. Strap length: 233 mm. Location Location: GPS + GLONASS. Location boost: QuickGPSFix. Sensors Sensors (internal): Motion sensor, compass, optical heart rate monitor. Sensors (wireless): Bluetooth