The main feature of this unit is the signal strength meter built into the masthead unit itself. This enables you to rotate your T.V. antenna while you are up the mast to get the best signal strength before you clamp the assembly permanently in place. No more climbing up and down the ladder to check T.V. reception! The masthead unit measures 100(W) x 90Z(H) by only 30(D)mm. It has 2 x downward facing female 'F' type output sockets, with a drip shroud. Two rubber boots are provided to waterproof cable entry to the unit. The masthead amp comes with a mains power supply which plugs into a power inserter. The power inserter sends power up the mast to the amplifier and then provides a D.C. power free signal to your T.V. set. All connections are by 'F' type connectors. Apart from that, the kit includes mast "U" clamp, 9V battery power supply to show signal when installing and sundry other hardware. 1 x UHF/VHF Masthead Amp, 1 x Power Injector, 1 x 9V Battery Pack, 1 x Mains Power Adaptor, 1 x U-Bolt, 1 x Mounting Hardware