What this means
The IEEE assigned the MA-M block F0D7AF5 to Dongguan Huili electroacoustic Industrial 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 F0:D7:AF:5, it is Dongguan Huili electroacoustic Industrial Co.,ltd hardware.