What this means

The IEEE assigned the MA-M block F023B9C to Shenzhen Lachesis Mhealth 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 F0:23:B9:C, it is Shenzhen Lachesis Mhealth Co., Ltd. hardware.