Alarm Clock Mezame-Collaso No batteries required Instructions (booklet) For those considering practicing with a clock. Since it was also used in conjunction with a wall clock, the usage period was short. The numbers are displayed one by one on the dial, and you can naturally learn how to read difficult times like ○ o'clock and ○ minutes, which is very helpful for understanding clocks. * The booklet may be folded. For those who understand home storage.