Features: C1 4 digit counting rings, tasbih faith digital counter rings, a user friendly Tasbih counter rings, up to 9999 counts. Multiple languages supported, mobile app control, touch quietly. Large display, clear show the digit, intelligent daily prayer reminder. 5 in 1 design, 5 size 16mm/18mm/20mm/22mm/24mm provided, replaceable rings. Press to count and vibrates when the count reaches 33, 66, 99 or 100 and set daily 5 prayer reminders. Support wireless charging, IP67 waterproof, without fear of water or rains. Specifications: Material: ABS Size: 16mm/0.62inch, 18mm/0.7inch, 20mm/0.78inch, 22m/0.86inch, 24mm/0.94inch(5 size replaceable) Name: c1 tasbih faith tasbeeh rings Counts: up to 9999 Input: 3.7V Package Includes: 1Pc Tasbih Rings(16mm/18mm/20mm/22mm/24mm Interchangeable) note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.