JSJ MONO TO AUX Cable 1.5m If your phone or MP3 player has a 1/4″ jack, you may use one of these to connect it to our cigar box guitar amps as well as other guitar amps and PA systems. The 3.5mm MONO TO AUX Cable, which we separately provide, is required to connect a phone to one of our smartphone amplifiers, which has a 3.5mm input port. gives users the option to combine professional speakers, mixers, and musical instruments with home audio equipment.
