I just got my third sensor and a monoprice 16foot usb 2.0 extension cable so i have one sensor way across the room and two up on the walls. I'll be getting two more extension cables and place sensors up in all 3 corners of the room i'm in, up near the ceiling.
I attach them with oculus sensor wall mounting hardware you can google that and pick from several different types. Mine are sitting in a holder that is then doublesided-heavy-duty-sticky-taped to the walls and ceiling.
The limiting factor at this point is the rift cable. I'll have to see if i can extend that as well. It says it's 2.5m or 8 feet.
Still.... i can stand in the middle of my computer room and do the roomscale setup and it's just so fun. I giggled all the way through it.
I believe the distance away the sensor can be from the rift is 14 feet., that's not the cable length that's the direct eye sight length between sensor and headset.
My other two extension cables will probably be usb 3.0.
speakers and mic are build into the headset
I'll have to video the roomscale setup and post it, it's really neat.