What is Addzest?????

My Parents (lol) hava Van that hasa sound system in it, and we've had the Van for about a year now and when we bought it!
it had an Addzest head unit
6 x6x9 speakers
4 x dual cone speakers
3 x 1000wat amps
+ 2 x 15 inch Orion Subs but don't need to know about these
also addzest custom box which holds the two subs 4 dual speakers and the three amps!
I've tried lookin on the net for info on this brand but nothing!
If anyone knows anything on this brand let me know and roughfly what is it worth
THANKS!!!!!