RESOLUSTION In case of iPhone X, you can choose the resolution from 192x144, 352x288, 480x360, 640x480, 960x540. 4. FILE FORMAT Extension: mp4 Video: H.264 30fps Audio: AAC 44.1kHz 5. ADDITIONAL FUNCTIONS By "In-App Purchase", you can use the following functions. •Automatic sleep of monitor •Delayed start of recording •Extending of recording time