K2 Duke 
AVA have produced a affordable rotary pen with the quality of an expensive one
Made from aircraft aluminum and contains a carbon brush motor (3.5w)
Adjustable needle depth, and comes with a unique magnetic RCA cord 
Frequency - 0-9000rpm
Start Voltage - 3v DC
Working Voltage - 5-9v DC
Stroke - 3.5mm
RCA Lightweight magnetic connector included.
Warranty - 3 months - NB is void if machine has been taken apart or misused in anyway
PLEASE BE AWARE NORMAL RCA CORDS CANNOT BE USED WITH THIS MACHINE