City 31 Compact Pocket Radio The Grundig City 31 is a compact pocket sized radio and is therefore ideal for travelling. You can listen to the latest news or music anywhere. The large, built-in speaker ensures a strong sound. The City 31 also features an automatic FM focus tuning (AFC), telescopic and ferrite antenna and a stereo headphone port. The required earphones are included. Includes: headphones. The City 31 also has a headphone jack through which you can listen to the radio. High-quality headphones are included for the optimal sound experience.