Well here are pictures of the inside of a Whistler SRT-30R. I don't recommend to anyone taking apart their RD one it most likely voids warrenty and two if you don't know what you're doing depending on the model it might screw something up but yes the RD is still working perfect :P
Top down view.
Frontal view of the laser sensor and the horn. Sorry for the blurriness of this one but for some reason it came out this way.