Yeah @Mike59, its not a problem… You can transfer the licenses back and forth, via the Roger On In, and vice versa… I should imagine, it will take about 5 minutes to do this, take the licenses out of the Marvels, back into the Roger On In, then transfer them into the Lumity’s, easy peasy it sounds complicated, it is in actual fact, a very easy process… In truth, I have 3 sets of aids, Naida P90 BTE UP’s, Naida M70 BTE SP’s, and Marvel 90 RIC’s, with 105db custom receivers, each have a set of Roger X receiver licenses, both Naida’s have Type 02, the Marvel RIC’s are Type 03, only 1 receiver was bought new, I didn’t make that mistake again, the rest where bought 2nd hand on eBay, my cheapest 02 was £56, and only 6 months old, according to the label on the box, if you buy an extra set of Roger X receivers on eBay, make sure their serial numbers are above 1744… I am sure your A.uD will have a Roger Installer to stick them into your backups, the problem is, if your Lumity aids are not working or they are kaput, how do you transfer the licenses back out, and into your backups, if you get my drift… Alternatively, if you buy a Roger Type 03 NeckLoop for £130 ish, you always have that backup, no need to buy other Roger X receivers, and no Roger Installer required, it will also work with your Roger On In… Cheers Kev