amazfit-bip s smart watch, 5atm waterproof device, with gps glonass and bluetooth, suitable for android ios phones, worldwide,

the strap is very light (31 grams). the battery can last for 40 days. water resistance up to 5 atm. i integrated gps, stainless steel button, 40-day battery life, health assessment, all-day heart rate tracking, gps system, 64-color reflective display, 10 sport modes , with swimming tracking, rich reminder function and weather forecast, biological tracker tmppg biological tracking optical sensor, three-axis acceleration sensor, three-axis geomagnetic sensor, charging time is about 2.5 hours, width 20mm.