This is a used ZR-4 system. Still works great and was tested with a laser gun. The kit includes

The display, mute button, cord to attach the ZR-4 to an Escort dash mount radar detector and 4 laser shifters. There are only spots for 3 on the display but you can always get a splitter to be able to use all 4 on one vehicle. The mute button is missing the rubber button cover but it still functions properly. If you have any questions please ask. Happy bidding!