Solid-State Electronic Hooter 3 Watt rms with variable Tone and Volume control. Tone frequency range is from 300Hz to 1000Hz and Sound output is 95dB rms at the distance of 1 meter with controls on the rear panel. DIN Standard Housing (96mm x 96mm x 86mm) Flush rear panel mounting in ABS plastic in Grey colour with suitable mounting clamps. Panel Cutout is 92mm x 92mm. Weight is 500gms for AC powered units and 350gms for DC powered units. Electrical ratings:-350mA @ 110 / 230V AC and 12 / 24V DC.