For the buy it now you'll get 1 Sigtronics SRS-4 Emergency Radio Switcher for US45S, US45D, EAIS4, EAID4.  Please read the above description and look at the pictures as they show what you'll get and how you'll get the item. It's your responsibility to make sure this item will work for your application.  It's not my fault if the item "doesn't fit".  I acquired this item in a large lot of new/takeoff surplus.  I'll be shipping this item free of charge!! 

*no warranties expressed or implied*

*a signature may be required upon delivery*