Whelen BETA112R Remote Beta Series Siren Output: 100 Watts. Amps Draw: 8 Amps Max. Voltage: 10-16 VDC (Negative Ground). Polarity Protection: Diode/Fuse Weight: 2.5 Lbs. Dimensions: 2.37" H x 7.1" W x 5.5" D. This is the Siren Amp only. The control heads are sold separately.