I've just received the first of this relatively new (to me at least) type of decoder, though I usually keep at least one of each of the more usual 8 and 21 pin versions 'in stock'. This new version has been bought for a purpose as I have one of the "Rails" Wainwright D Class 4-4-0 commissions (31574) on pre-order, anticipated either 3rd or 4th quarter of this year, so decided to get hold of the decoder in plenty of time in case any supply delays due to Covid-19 meant I'd have to wait. They're certainly small, even in comparison to many other decoders I've had, and this will be the first of my own loco's which take this type of decoder although I have come across one before when checking a loco for a friend. As usual, it's the 'LaisDCC' brand on which I've come to standardise for my non-sound fit loco's, cheap at under a 'tenner', and so far having fitted around 50+ have proved every bit as good and as versatile and controllable as the so called 'Premium brands'. Here it is compared to a UK 5 pence piece, so you get some idea of scale. Keith.