The Cel-Fi Pro boosts EE and other providers that use the EE network (Plusnet, BT Mobile, 1p Mobile etc)Supports 3G, 4G, and LTE phone signals to eliminate dead zones and dropped calls.
I've used it in my living room where there is no signal without it, and I get 5 bars when it's switched on.
The system has a LCD colour interface, is fully self-contained and self-configuring, and requires no external antennas or wiring.
I no longer have the instructions, but you can easily find them on the internet, however it's simple enough to operate without them.
It only takes minutes to get the booster up and running: position the Network Unit (receiver) in the location/window sill where you get the best signal, then put the Coverage Unit (booster) where you need improved coverage. Then plug them into the mains and wait 30 seconds or so for them to boot up.
It is in good condition and full working order, complete with its original screen protectors and original box.