From the web site....note the external mic input
2X More Powerful in Every Way:
Professional 11MP Sensor
2x Faster Image Processor
2X Sharper Glass Lens
Professional Low Light Performance
Full 170°, Medium 12°, Narrow 90° FOV in 1080p and 720p Video
120 fps WVGA, 60 fps 720p, 48 fps 960p, 30 fps 1080p Video
Full 170° and Medium 127° FOV Photos
10 11MP Photos Per Second Burst
One 11MP Photo Every 0.5 Sec Time-Lapse Mode
3.5mm External Stereo Microphone Input
Simple Language Based User Interface
Compatible Wi-Fi BacPac™ and Wi-Fi Remote™
Long Range Remote Control of up to 50 GoPro Cameras
Wi-Fi Video/Photo Preview + Playback
Live Streaming Video + Photos to the Web
HD HERO2 Cameras - Professional Power to the People