The Headset Buddy Mic Line Level 3.5mm Audio Input Adapter Cable for iPhone and Smartphones lets you connect professional audio equipment to you smart device. When you use the iPhone-Mic-Line adater with your smartphone or tablet, your device essentially becomes a soundboard or mixer. The adapter replaces the microphone level audio signal with a line level input, enabling you to record on your phone or tablet as if the sound was coming from your device itself.Professional Level Recording from Your PhoneThe Headset Buddy adapter is an attenuator cable that replaces your smartphone's audio signal with the line level input. You can then record from turntables, mixers, soundboards and other pro audio gear -- any outputs with a headphone jack or audio output jack. And the Headset Buddy Adapter guarantees crystal-clear sound recording.Note that while you can input stereo sound, it will only play back in the left ear.Wide CompatibilityThis audio input adapter is compatible with iPhone, iPad, iPod, Macbook, Macbook Air and Pro, Mac Mini and Pro, Android devices, Windows phones and tablets. It will work with most smartphones that use a combined headset and microphone jack. With a splitter, you can even use it with two audio sources at a time.This adapter is not to be used with microphones.How to Use the AdapterSimply plug the male 3.5mm (1/8 in.) TRRS into the headset jack of your iPhone, smartphone or other smart device, and then plug your audio source into the female 3.5mm (1/8 in.) TRS end of the adapter. Your phone or handheld device should then recognize that an external audio source has been connected, and its internal mic will shut off. You can now record using the external source. The adapter is compatible with any audio/video recording app or any function that the internal mic is compatible with.