Utilizing an internal microprocessor, the Skywriter has an electronically controlled smoke rate (with a programmable radio). This allows you to adjust smoke rate during flight and/or slave it to your throttle servo. It features an ultrasonically welded direct drive pump head, and weights less than 4 ounzes. The pump can operate from any 4.8V to 12V battery (6V + recommended). The kit includes tubing, fittings, a double screen filter and check valve, everything needed except smoke tank and smoke muffler!