Converter adapter to connect an mp3 player, smart phone etc. headphone output to a gutiar amp or into a mixing desk via a DI box. 3.5mm Stereo input socket to mono 1/4" plug out, with L+R summing and level conversion. Requires an additional cable with 3.5mm plug to connect to your device. (Usually this will be a 3.5mm to 3.5mm cable.) Boot colour = Orange