VANDAL RESISTANT SPEAKER W/TRANSFORMER AND CALL IN SWTCH • Withstands attempts at vandalism in hostile environments • Grille openings are cross-positioned so nothing can enter the speaker • Mounts with one-way security screws (included) • 3" weather-resistant cone speaker • 1/2-watt speaker power on 25V speaker line • Optional low impedance 8-ohm speaker operation • Available with metal call-button.