High Output Internal Horn Sounder. SO6012 is a Horn Sounder, Sound is Output is 130 dB(A). A range of horn sounders with different sound outputs and current consumption, suitable for use in internal and external applications. Specification: Voltage: 6 - 15 vdc, Current: 1.5A, Sound output at 1m: 130 dB(A), Frequency range: 1.7 - 2.4kHz, Material: ABS, Weight: 1100gm, Size mm: 127 x 100 Horn Dia 115.