It says it is an ambient light sensor, but is it a phototransistor? Something else? It has Vcc and Vout pins. Bonus points if you include a data sheet.
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Maybe this one?
The ALS-PDT243-3C/L451 is an ambient light sensor using a photo transistor in a DIP package.
It's a phototransistor. Here's a link to it (5-pack): http://comingsoon.radioshack.com/radioshack-5mm-ambient-light-sensor-5-pack/2760326.html
No datasheet though.