Zoom's professional quality preamps and up to 70dB of gain mean the P4 can be used with the most demanding microphones. Each of the four independent headphone outputs have dedicated volume control. The P4 is easily incorporated via computer or phone for remote interviews. With the P4’s built-in mix-minus feature, distracting echo and feedback will automatically be eliminated. Customizable Sound Pads can instantly trigger music, ads, jingles, and even pre-recorded interviews. Zoom's P4 is also a 2-input, 2-output audio interface, allowing you to directly stream or record to your computer, Android or iOS* device (Apple Lightning to USB camera adapter sold separately).