What this means
The IEEE assigned the MA-S block 70B3D533E to Dynamic Connect (Suzhou) Hi-Tech Electronic 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:B3:D5:33:E, it is Dynamic Connect (Suzhou) Hi-Tech Electronic Co.,Ltd. hardware.