What this means
The IEEE assigned the MA-L block 4887B8 to TCL King Electrical Appliances(Huizhou)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 48:87:B8, it is TCL King Electrical Appliances(Huizhou)Co.,Ltd hardware.