... a bi-directional amplifier with attenuation and ALC function via remote monitor, which used to enhance signals between a mobile ... medium-size areas such as home, offices, shops, and basements, remote countryside , car, ship and mining well etc. Product FeaturesHigh system ... % 45~55Hz (5Vdc 600mA )Dimension (mm)140×100×50mm(without connector)Weight(kg)1kgShipment Dimension (mm)260×210×95mmShipment Weight ...