This company sells and audible alarm for the primer tube to tell you when your almost out of primers. It's actually a Dillon alarm they modified to work on a LNL-AP
Their products are pricy but are well thought out. The one problem with my LNL-AP is that I am loading 9mms shells and don't need the long handle that Hornady supplies. This company shells shorter ones with a roller handle.
I actually took my handle and put it in a Hydraulic press and bent it so I don't have to lean down to top out the stroke. It makes using the press much more comfortable for me.
Mine is setup on 9mm and runs really well and I wouldn't trade it for anything.