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Function/Features Weslamic C01 Smart Zikr Ring Other Zikr Rings Weight 6g 20g Material ABS Resin Plastic/Metal Bluetooth version Bluetooth 5.1 ❌ Compatible System Android 5.1 / iOS 10.0 or above ❌ Screen OLED, 0.49-inch smaller screen Vibration Alert ✔ ✔ Prayer reminder ✔ ✔ Battery Capacity 40mAh 30mAh Theoretical working time up to 15 days up to 10 days Standby time up to 30 days up to 20 days Quick charge 1.5 hours 8 hours Prayer direction ✔ ✔ Replaceable finger ring adjuster ✔ ❌