Controlled multi-protocol booster for use with MM, DCC, or mfx control panels. Suitable for systems with feedback via RailCom and symmetrical track voltage. Features adjustable short-circuit sensitivity and track voltage (10 - 20 V, in 1 V increments). The RailCom cut-off of the booster can be turned on or off. The internal short-circuit protection is also switchable. The maximum track voltage is 18 V at 5 A (regulated), with an adjustment option for 12 - 24 V (regulated). The supply voltage ranges from 12 - 18 V, depending on the set track voltage.