Dogtra. I own a PAC myself but after about 7/8 years the batteries are completely gone. Most of the French professional gundogtrainers use Dogtra , my uncle uses Dogtra remote trianer and anti bark with his Mallinois. For me the best available at this moment on the European market. Small, effective, resistant. My next will be a Dogtra.
Tri Tronics is also extremely good but not available in Europe.