Never know when you might need one. The newer Halotron may even spare your electronics.
Every hifi systems should have one.
http://gizmodo.com/5684978/extinguish-fires-without-extinguishing-your-electronics
Halotron I extinguishers, like carbon dioxide units, are "clean agents" that leave no residue after discharge. Halotron I is less damaging to the Earth's ozone layer than Halon 1211 (which was banned by international agreements starting in 1994). This "clean agent" discharges as a liquid, has high visibility during dischage, does not cause thermal or static shock, leaves no residue and is non-conducting. These properties make it ideal for computer rooms, clean rooms, telecommunications equipment, and electronics. These superior properties of Halotron I come at a higher cost relative to carbon dioxide.