Yeah @Zebras has covered most of this question @Baltazard, and @Psych1 as well… eBay is a great source for (02 & 03 Roger x receivers) not so long ago, I bought a (02) that was only 6 months old for around £56, and that price was what I offered… And yes you need the Roger Installer, (got mines from Korea) unless you have a Roger “In” ALD… One thing I would say, even if your hearing is very poor in one ear (like my left ear) no response above 3k, I notice a big difference with only 1 receiver license installed, clarity and word recognition is poor, but with 2 receivers, it is much improved… I tried the first couple of years, with the Roger pen, and only 1 Roger X (03) (twas all I could afford, at the time) it was poor, in comparison to 2 receivers… I am very patient when buying Roger X receivers, I will wait months for the correct price, well the correct price for me, and I now have 3 sets of Roger X, 2 x sets of (02) 1 x Set of (03) saves me swapping them around, Naida P90 have (02) my backups, Naida M70’s (02) and Marvel 90 RIC’s (03)… All the bases are now covered Cheers Kev