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. Counter ring is equipped with a high capacity battery for days-of normal use. It can be charged anywhere, any for time-via a USB- cable to an adapter, power banks or computer. The key-has passed the professional key-life test, and has been pressed 10000 times-a day. The ring has a built-in 40mAh, which can be charged when put into the charging bin. The battery capacity of the charging port is 120mAh. Specifications: Material:Zinc Alloy Size:As Picture Shown Color:Black/Silver/Gold Dimensions:18mm 20mm 22mm Package Includes: 1x Counter Ring 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.