Features: 22mm rings with build-in bluetooth-compatible compatibility, easily connect with the application, and you can receive prayer time reminders through counter or mobile application. Equipped with integrated button that makes it easy to track your daily count at any time. Press its button to count, when it reaches 33, 66, 99, or 100, it will vibrated. Equipped with a 0.49inch display screen, which can display time, recitation count, and prayer count. Equipped with a large capacity battery, can use normally for 3 days and charge through a USB cable. Specifications: Material: ABS+Metal Color: Black, Green(optional) Size: about 22mm/0.86" Count Range: 99999 Input Signal Voltage: 1.5V Package Includes: 1x 22mm Tasbih Tally Counter Rings note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.