Valcom 6 Amp 2 Wire Clock Driver for use with 2.5" and 4.0" Digital includes a 6 amp, current limited power supply and a Valcom digital protocol mixer. When combined with a 2.5" Digital Clock, it can provide correction data and power to up to one hundred twenty (120) analog, forty (40) 2.5” digital or thirty (30) 4.0” digital clocks. Multiple divers may be combined in a single system.