Actually there are two "chips", the radio and the audio amp. The receiver covers the FM broadcast band plus up to 110MHz and down to a few MHz. This makes it a great circuit to use with "bugs" and wireless mikes. Up to 1.5 microvolts of sensitivity.

To increase sensitivity to 1.5 microvolts remove the capacitor from pin 1 and replace with a 10K ohm resister.
The interstation noise level can be decreased by choosing a low-value capacitor at pin 3. Silent tuning can be achieved by omitting this capacitor.