Rode Wireless Pro Mic System Unboxing... So Many Extras! 

You can change the Gain Mode separately between the two transmitters (from Auto to Dynamic). You can't adjust the gain up or down on the two transmitters independently. The gain adjustment on the receiver is specifically for the output to your camera.

I purchased it at B&H.

4 x 3.2 x 2.8" / 101 x 82 x 70 mm