Multifunctional intelligent prayer rings counter, 4 digit digital counter, and five in reading rings functions. Waterproof design, easy to wear. Connection to the mobile app and record the number of prayer. The digital counter accurately counts. Widely used in religious ceremonies, daily prayer, ceremonial ceremonies, and other occasions. Size:16.5mm/0.64inch, 18mm/0.7inch, 20mm/0.78inch, 22m/0.86inch, 23.9mm/0.94inch(5 size replaceable) Colour:Black Material:ABS Package Contents: 1 * Intelligent Rings Counter(5 size replaceable) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.