The perfect compliment to those using Field Recorder, WavePad or similar recording apps for Apple iPhone®, iPad®, Blackberry phones and more! This 3.5mm 4-Pole TRRS to 1/4" cable jack allows you to connect a guitar or pro mic to your iPhone®, iPod® or Blackberry and take advantage of the many apps designed for audio recording on a Smartphone. Using external microphones will improve the quality of your recordings. Built with phantom power blocking and impedance matching components. This cable also features a headphone monitoring tap for critical applications such as field reporters & news gathering professionals. Note: To hear the mic signal while recording, you need to use a recording software app with a monitoring feature that amplifies and drives the signal to the headphones.