This is a Talema 4 channel, 128-step attenuator 'pre-amp'.
Remote control has functions for: on-off; channel select; volume; mute; and display brightness.
This one has the higher-spec transformer (230V) and performs perfectly.
Compact size: 220(w)x230(d)x60(h) mm. No mains lead was supplied (packaging has no room for one).
Imported by me from China, it cost around £160 after duties, etc.
Nice bit of kit. Selling for £90 plus delivery.