Features: With built-in bluetooth-compatible, counter ring is easily connected to the app. You can receive 5 prayer for time reminders via the counter ring or the smartphone app. for 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 for 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 for time via a USB cable to an adapter, power banks or computer. Specifications: Bluetooth-compatible 5.1 Color: Black/Green/Rose Gold/Silver Applicable systems: Android 5.1 or iOS 10.0 or later Screen: OLED, 0.49 inch, 72x40 Battery capacity: 40mAh Material: aluminum alloy Button: 1 button Watch: up to 7 days in normal use / up to 30 days in basic use Sensors: vibration motor Dimensions: 20 mm, 18 mm Weight: 120g Note: 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. Package includes: 1x for Smart Counter Ring