Harley Benton Jackamp Mobile, adapter to connect guitar, bass, keyboards, microphones, etc. by a 6,35 mm input jack, 6,35 mm output jack to connected to an amplifier or mixer, 3,5 mm stereo headphones jack, compatible with iOS/Android/Windows apps: effects, tuners, metronomes, recorders, amps etc., dimensions whd: 32 x 15 x 185 mm, weight: 20 g, to activate the line signal input, please unplug and re-plug the Jackamp Mobile after the app is already opened and it will be identified correctly