What this means
The IEEE assigned the MA-M block 3C427ED to ROBOX SMART MOTION (WUHU) CO.,LTD. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 3C:42:7E:D, it is ROBOX SMART MOTION (WUHU) CO.,LTD hardware.