https://www.keyence.co.uk/products/sensor/fiber-optic/fs-n40/models/fs-n41c/
Fibre Amplifier, M8 Connector Type, Main Unit - FS-N41C | KEYENCE UK & Ireland
FS-N41C, Fibre Amplifier, M8 Connector Type, Main Unit, FS-N40 series, KEYENCE, UK
connector typemain unit