Sony 4K Ultra HD camcorder features : The Sony FDR-AX100 camcorder features several interesting functions. The 4K video camera features Dual Video Recording. This convenient function allows simultaneous recording of AVCHD movies in Full HD format perfect for preserving precious memories, and MP4 format for easy transfer to smartphones or tablets and sharing with friends. Dual video recording is also available for the combination of XAVC-S and MP4. Simply touch your mobile device to your Sony 4K Ultra HD camcorder via NFC / Wi-Fi function and instantly transfer MP4 movies to your mobile device, allowing instant uploading to websites.