What is a Sustainer?

[amt7565]

Perhaps I have been left out in the cold, but can someone tell me what a sustainer is?

Thanks.

[AmazinAzian12]

Search the forums. there is bound to be something on it.

[chopvai]

http://www.fernandesguitars.com/whatis.html

[mi2tom]

They sustain the notes

[Ibateur]

The sustainer i think essentially creates a pulsating magnetic pull on the string that keeps it vibrating (and thus being picked up by the pickup).