Amazfit Band 7 offers big features in a small package. The Band 7 has a 1. 47 display bring you a clear visual experience. When fully charged the device can last up to 18 days with a typical use and up to 9 days with heavy use. The Amazfit Band 7 can assess three health indicators (SPO2, heart-rate and stress) with one click in only 45 seconds. The Band 7 offers 120 sport modes to track useful exercise data like distance, speed, heart rate, etc. Wrist Fitness & Health Tracker. Band Material Silicone, Case Material Polycarbonate. Metrics Measured Blood oxygen, Hours slept, Calories burned, Multi-Sport Tracking, Geomagnetic sensor, Accelerometer. Android, Apple iOS Compatible. Lithium-ion Rechargeable Battery. AMOLED, Digital 1. 47 Inches Display. 1 Year Warranty. Safety Data Sheet.