The features of this mod are quite simple:
It shows a countdown of the time a TNT-Entity or a Creeper has until it explodes, above the entity itself.
Users using this mod will have a saver experience while playing the game.
It's also helpful in PVP, but might be forbidden on some servers, since it grants an advantage against other players.
Since of version 0.3 you can turn the countdown on and off and change the time from seconds to ticks remaining until the explosions happens.
Both these settings can be accessed via the Mod Menu settings page.
Versions for Forge are discontinued.
Note for the Fabric Version you need the Fabric API!