Features: Built in Bluetooth-compatible, the counter is easy to connect to the app. You can receive reminders of prayer times through a counter or phone app. The counter has an integrated button that makes it easy to track of your daily count at any time. Clicking the button to count, and the counter vibrates when counting to 33, 66, 99, or 100. The counter has a built in 0.49inch OLED display that displays time, number of chants and prayer times. Equipped with a high capacity battery and can be used normally for 3 days. It can be charged anywhere via a USB cable to an adapter, or a computer. Specifications: Material: ABS, Metal Counts Range: 99999 Input Signal Voltage: 1.5V Type: 18mm/20mm Package Includes: 1x Digital Tasbih Tally Counter note: Please allow 1-2cm errors due to manual measurement, make sure that 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.