Peace be upon you. I have the well-known Fitbit Air bracelet. It's pink, but I bought it a black bracelet as shown in the picture. I haven't had it for long, light and clean use. Bracelet specifications: Very light weight and doesn't bother you at all when wearing it. Battery: Lasts up to 7 days, and a full charge takes about 90 minutes. Water resistance: Up to 50 meters. Heart rate sensor during exercise, rest, and sleep. * Sleep tracking: Supports sleep stage tracking, sleep duration, and sleep quality. Your readiness for exercise: Step counter sensor and exercise sensor. And other features. The price is 450 with the black bracelet.