The No.15 offers a direction to Mecca function, and a location-specific Islamic prayer times function.
Centre dial: Hours, Minutes
Top dial: Direction to Mecca (based on phone location)
Left dial: Seconds
Bottom dial: Indicates the time being displayed on the centre hands. From right to left: Current time, Fajr prayer time, Dhuhr prayer time, Asr prayer time, Maghrib prayer time, Isha prayer time.
Top pusher: Activate direction to Mecca function, connect to phone
Bottom pusher: Cycles through time indications indicated by bottom dial