v1.5 Fit Google Play >= Android9(API28)<br>v1.3 Adjusted timing Android4.4(API19KitKat).<br>v1.2 Selectable notification.
Only the current version so far — new entries appear as the app ships updates.
Time Signal DX is a lifestyle app by REMIX with 50+ downloads (about 50 estimated). Released Nov 13, 2016. Install growth, rank history, SDKs and ad networks.
From the store listing: “Sound of an hour and 10,30min by the Time Signal.”