With 6 iron blocks, 2 glowstone blocks, and a noteblock, you can make an alarm! A warning text wwill be diplayed for everyone, as an alarm sound plays. If redstone is on the sound will play, if not, the sound will stop.
Perfect mod if you got a mass destruction machine on a server with your friends!
Also make sure there is only one alarm in the world. else it will not work. So make sure to lock the recipie if on a server.
