Transistors are powerful little electronic switches, and we really like these PNP transistors whenever we need to control medium-power electronics, such as small motors, solenoids, or IR LEDs. We find them so handy, they now come in a pack of 10!
Each transistor is a general purpose amplifier, model PN2907, and has a standard EBC pinout. They can switch up to 60V at peak currents of 600 mA (not continuously, just peak!), with a DC gain of about 100. They're basically your garden-variety PNP, and do the job with class!
If you need NPN transistors, you can grab some 'matching' PN2222's here.