Howler Alarm

The Howler Alarm is triggered by redstone and can be heard for 64 blocks by default. It can be upgraded to an Industrial Alarm to change the color and add lighting effects.

This item is from the Nuclear Control mod. The howler alarm works well for telling you when your nuclear reactor is overheating (with a heat sensor) instead of building the more expensive Industrial Alarm which works better for intruders.

This item can be disabled by server mods it can still be crafted but you will not be able to place it. (At least this is the problem I find)

To add your own sound - put it to the "resources/newsound/ic2nuclearControl" folder in your minecraft folder. Sound should be in ogg format and it's filename should start with "alarm-".

Item is from Nuclear Control Mod Forum Link

WARNING: If placed next to an active redstone torch, your game is likely to crash.