You can get into a 900MHz system at a phenomenal price. Whether you would like to go long range or are looking for the superior penetrating ability of 900MHz, this deal is hard to pass up.
The newly released R9MM receiver is pretty darn small and retains the majority of the features of the R9 Mini. It still has super low latency, high precision and a very low mass. The most important new feature is that the S-Bus port has been inverted to make the R9MM compatible with a wider range of external devices.
Below is a list of features and specifications for the R9MM.