From a quick scan over the manuals and that I haven't be in contact with the C1 Roav in a few months, noted the following differences;
- No hardwire kit (listed)
- 60fps option for 720p
- Additional date & watermark format options
- Increased angle lens 155 instead of 145
- Video format now mp4
Possible these have been around in newer firmware's but as mentioned, been a few months since using one.