Because if u ground pin 9 on ht chip, then u can activate the tomy so it works exactly like a booster, then on the transmitter u switch a ground to the chip, and now u have a booster!
but now mines dead ! lol
If tomy had left the chip exposed,it would b so easy!
http://members.aol.com/rchelicam/microszr/microszr.htm
look there!