夜や光こう時計どけい

noun

luminous watch; luminous clock

Refers to a timepiece whose hands or dial glow in the dark, typically using phosphorescent paint or tritium tubes.

• 夜や光こう時計どけいなら、暗くらいところでも時じ間かんがわかる。

  With a luminous watch, you can tell the time even in the dark.