Low HP Alert is a very simple Addon which will alert you with text and sound when your HP drops bellow 50% and 25% (30% in Tankmode).

Features:
- Extremely lightweight, accurate and fast
- Alerts with a big font and custom audio files
- Tank Edition supports only 30% HP
- Audio files are designed like aircraft cockpit announces -- "beep beep fifty"
- Audio alerts are played even if sounds are disabled (played on master audio channel)
- Works with every language

Options:
/lowhpalert - shows all commands
/lowhpalert tankmode - only alerts at 30% HP (good for tanking)
/lowhpalert combatmode - only play alert sounds in combat
/lowhpalert sound - turn off all sounds

Options are saved for each character.

Video:
http://www.youtube.com/watch?v=LiBRN_QeI94