1. Model: Gt20 2. Dimensions: 51*40*12mm 3. Case Material: Zinc Alloy Plastic 4. Strap Material: Silicone / Stainless Steel 5. Screen: Ips 6. Screen Size: 1.69inch 7. Resolution: 240*320 8. Chip: Hs6620 Bk3266 9. G-Sensor: Sc7a20 10. Sram Sflash Ui Flash: 90kb 512kb 64mbt 11. BluetootH-Compatible: 5.0 3.0 12. BluetootH-Compatible Distance: 10-15m 13. Battery Capacity: 220mah 14. Charging Way: Magnetic Charging 15. Battery Life: 5 Days 16. Standby Time: 15 Days 17. Waterproof: Ip67 18. App:fitpro 19. System Requirements:ios 8.0 / Android 5.1