From a German bagpipe forum:
Half-Set, Concert pitch, 3 keys, leather bag, used, price on negotiation. The rest is a bit confusing: bellows that can be switched off ?!? Contact Jörg at the given email address.
Cheers, Thies
A comma is missing.
“Uilleann Pipe half set von Andreas Rogge. chanter in D mit klappen 3 drones mit abschalter , blasebalg und sack aus rindsleder .Gebraucht VB”
So it means 3 drones with drone switch.