Features: AMS Heart rate sensor--The highest precision sensor so far. Dual-Core Chip--The stability of monitoring heart rate while exercising. Continued brightness display with ULP--Clearly visible in the sunlight. An impossibly thin 8.4mm design--Thinnest in the world. 30 Grams with all-metal appearance: 17-4PH Saintless Steel. Replaceable 20mm Wrist Strap (Medical Grade TPU Meterial) --Various designs of Wrist strap. The stability of Heart Rate monitoring up to 7 days--Accurately recording of dynamic and static Heart Rate. 24 sports record management--Accurately records walking, running, push-up, rope skipping, badminton, table tennis, etc. Auto-Monitoring for sleeping up to 24 hours--Combined with heart rate curve to identify the sleep state. Battery life: Up to 7 days--Average 4 times power charging per month.
Size/Purity (Volume in oz., fl oz., grams, karats, etc):N/A If it applies, information regarding the size can be found on Tom Top website by clicking below: