Cheap AM / FM radio and it work amazingly good.

A radio cost lest than $3 and it works amazing on the AM and FM band.

Signal to Noise ratio (S/N) : 50 dB
Impedance: 32 Ohm
Power Output: 1mW
Frequency Range: 88108mHz

Power by 2 x AA battery = 3 Volt

This mini-portable radio catches RF signal easily and the sound output better than average as good as expensive radio.