Sport Fitness Tracker, Joso Heart Rate Fitness Wristband Smart Watch Waterproof IP67 Activity Tracker Smart Bracelet with Stopwatch, Pedometer, Calorie Step Counter, Sleep Quality Monitoring - Black Upgraded Smart Bracelet - 0.91 OLED screen display. With stylish and brightly appearance, TPU strap material, using medical grade hypoallergenic material and adjustable snap strap. Adjustable to suit your wrist easily with perimeter between 14.22cm/5.6"- 20.82cm/8.2". Only weights 20g, more comfortable to wear and ultra light weight Bluetooth & USB Data Synchronization - Bluetooth 4.0 low-power wireless data synchronization, syncs via iOS and Android App. (Bluetooth Name: UP). Compatible for Android 4.4 & IOS 8.0 and Above Multifunction - Message & Call Reminder/Anti-lost Reminder/Smart Alarm Clock/Shake Photograph. Support sports monitoring & sleep quality monitoring, can be use as Pedometer, Fitness tracker, Healthy & Sports Assistant, etc. Perfect for running, climbing, cycling, indoor and outdoor IP65 Waterproof - Friendly offer fully dust protection and water protection when submerged in up to 1 meter of water for a 30 minute duration.(Note: IP65 is meant to help protect against accidents, not enable you to perform daring liquid-infused stunts.) Track and Trace your Health Parameters - When Bluetooth paired, sync to the APP giving you a real-time assessment of your exercise throughout the day. Smart Bracelet only displays the time, date, steps, distances and calories clearly, other data like sleeping only shows on APP