Sapphire Decoder R8245
Mini Sapphire Decoder R8246
Both allow set amounts of "water" & "fuel" can be stored providing real time fuel consumption. Burn rates can be selected
Both supports 1 Amp continuous current with 1.5 Amp stall
Both have low speed "gear" for shunting operations
and both are 23mm x 16.5mm x 6.5mm
Apart from a slight price difference what's the physical difference ?