Features: With built-in BLE5.1 version, it can quickly connect to the app, get accurate direction and synchronsie data with your smartphone and watch. 0.49-inch OLED display showing the time, allows you to see clearly of the numbers of chants and prayer times. An integrated CNC button, you can easily keep track if your daily Tasbeeh count at all times, click the button to count, it will vibrate when the count reach to 33, 66, 99 or 100. Equipped with a 40mAh high capacity battery, long battery life up to 3 days of normal use. Lightweight and available in 4 colors, making it comfortable to wear, stylish and youthful, great gift for your Musilim friend. Specifications: Model: M02 Pro Bluetooth-compatible: BLE5.1 System: For Android5.1 or iOS10.0 or higher Screen: OLED, 0.49", 72x40 Battery Capacity : 40mAh Button: 1 Button Charging Port: Pogo Pin Battery capacity: 40mAh Theoretical Working Hours: up to 3 days in typical usage/up to 15 days in basic usage Sensors: Vibration Motor Material: Zinc Alloy Size: 18mm, 22mm, 22mm(optional) Color: Black, Dark Green, Silver, Rose Gold(optional) Package Includes: 1x Smart Counter Ring note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.