The SRx4 Dual 4-String Differential (Long Range) Smart Receiver Board has 16 ports. Compatible with F16V3, F48, F16V4, F48V4, F16V3 or F16V4 Differential Expansion Boards - please note that the V3 product range will only be able to make use of the first 12 ports on this board, as the V3s only support chains of 3 smart receivers. 

A common question asked about these "Are these all seperate ports, or just multiple smart receivers in one board".  The answer is that this is effectively 4 smart receivers on one board. It allows for tidier remote boxes, easier management, less cabling, and it is also cheaper than 4 Smarts!  If configured correctly, you could easily run a 16x150 megatree from this board, using only a single port on your F48 or expansion board. The options are endless.

Note: Supports 3-wire pixels only.