Fostex AR-4i Audio Interface for iPhone 4/4S/iPod Touch 4G, Battery Powered Record/playback via dock connector with built-in AD/DA converter Equipped with 3 stereo inputs (Line/Mic) and 2 condenser cardioid mics 4-dot LED level meter for input monitoring; thumb wheel input gain control Supplied with sturdy hand grip Set-up app supplied free from Apple App Store