Brand: WESLAMIC Name: iTasbih-Salam Weight: 7 grams Ring Size: 18 mm, 20 mm, 22 mm Bluetooth Version: Bluetooth 5.1 Material: ABS Resin Compatible System: Android 5.1 / iOS 10.0 or higher Screen: OLED, 0.49 inches Battery Capacity: 40 mAh Theoretical Working Time: Up to 15 days Standby Time: Up to 30 days Fast Charging: 1.5 hours Vibration Alert: ✔ Prayer Reminder: ✔ Prayer Direction: ✔ Replaceable Finger Ring Organizer: ✔ Unbeatable Price🔥🔥🔥