What this means
The IEEE assigned the MA-M block 70F8E70 to SHENZHEN Xin JiuNing Electronics 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 70:F8:E7:0, it is SHENZHEN Xin JiuNing Electronics Co Ltd hardware.