Features:OOTDTY   With built-in bluetooth-compatible, counter ring is easily connected to the app. You can receive 5 prayer time reminders via the counter ring or the smartphone app.Smart tally counter ring has an integrated CNC button so that you can easily keep track of your daily count at all times.Click the button to count and the counter ring vibrates when the count reaches 33, 66, 99 or 100.Counter ring has a built-in 0.49" OLED display showing the time, number of chants and prayer times.Counter ring is equipped with a high capacity battery for 3 days of normal use. It can be charged anywhere, any time via a USB cable to an adapter, power banks or computer.Specifications: Bluetooth-compatible 5.1Color: Black/Green/Rose Gold/SilverApplicable systems: Android 5.1 or iOS 10.0 or laterScreen: OLED, 0.49 inch, 72x40Battery capacity: 40mAhMaterial: aluminum alloyButton: 1 buttonWatch: up to 7 days in normal use / up to 30 days in basic useSensors: vibration motorDimensions: 20 mm, 18 mmWeight: 120gPackage Includes: 1x Smart Counter RingNote: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.Thanks for your understandings.