One touch,tip heats up instantly with the push of a button! can heat-up up to about 1000C/1832F in a matter of 2-3 seconds.Precise, the filament tip makes precision burns even on the finest threads and knots.Battery operated,the zapper uses 1xaa (1.5v). get multiple hours of use from this tool with just one battery.Easy to use,simply push the button and touch to your thread. after youre done, let the tip cool and replace included cap.Professional finish, burn excess string at the edge of the knot, creating a clean finish.