The pocket analog radio, known by the bland model number SRF-39FP, is a Sony “ultralight” model manufactured for prisons. Its clear housing is meant to prevent inmates from using it to smuggle ...

A small analog model — the SRF-39FP — has a clear case that prevents inmates from using it to smuggle goods. And it only costs $30, which makes it the most inexpensive radio available in ...

It might not look much, but the Sony SRF-39FP pocket AM/FM radio is regarded as the audio player of choice in prisons across the U.S. The New Yorker has ...