パタパタ時計どけい

noun

flip clock; flap clock

A clock that displays the time using split flaps that flip over, often with a distinctive flapping sound.

• 駅えきの待まち合あい室しつにパタパタ時計どけいが置おいてある。

  There is a flip clock in the station waiting room.

• パタパタ時計どけいの数すう字じが変かわる音おとが好すきだ。

  I like the sound of the flip clock's numbers changing.