Honeywell FG-730 FlexGuard Dual Technology Glassbreak Detector.
Unused, open box item. 

ALL four of them, the packaging has shelf wear, is heavily distressed, and worn. 

Three of them all have manuals and come with mounting screws.

One of them was opened and left in the open, that one is a little dusty and is missing the mounting screws. That is the one pictured. 

Again, ONE detector is dirty, and is missing mounting screws. 
ALL packaging is heavily worn. 

You get four detectors for the price. 
COMES AS SHOWN.
SEE PICTURE FOR DETAILS.