BATTERY & ELEC MOTER IN A VERTICAL TUBE THAT SLIDES UP & DOWN A SHAFT IN THE BACK OF THE MITRE BOX. A HANDLE LOOPS OVER, BENDS DOWN TO HOLD SAW BLADE HOUSING CONNECTED BACK. BELOW IT IS A SPIRAL SAW BLADE GEARED TO THE MOTOR. AS THE SPIRAL TURNS IT MOVES FORWARD ALONG ITS AXIS AND CUTS THE MATERIAL, SPITTING OUT DUST AS IT GOES. A CARBIDE STRIP IN THE HOUSING ABOVE THE WIRE RESTS ON THE SPIRAL AND SHARPENS IT AS IT TURNS. A LASER LIGHT MARKS THE ANGLE CUT IS LOCKED W/ THUMB LATCH ON HANDLE