We picked this up from an auction I believe it was a liquidation of a city building or a department maybe the sheriffs office. We have no idea if these work I’ve got a full Gaylord of them maybe 200 units. We are based in Union City California if you want to swing by and test them you’re more than welcome. I know we have atleast 50 of this part number. As i go thru the box i will post the other parts. This auction is only for one unit not for the whole Gaylord. I only provided that information as a reference.