Description Product Reviews Valcom V1042 Slimline Wall Paging Speaker Modern Look at Affordable Prices! Excellent Voice and Music Quality Easy Install Built-In Amplifier Built-In Volume Control Available in Custom Colors Valcom Power Units -1 Ideal for Offices, Clinics, Dentist Waiting Rooms, Retail, and Schools. Valcom Power Units Every Valcom product is marked with either a positive, negative or neutral power unit. Simply add up the negative power units and then purchase a power supply with a greater value than the total power consumption of the system. If you have extra power units you can add speakers to the system at a later date, extra power is OK lower power will cause a performance problem on your paging system. One Valcom power unit = 50 mA, -24 Vdc 0 Reviews Hide Reviews Product Reviews