VANDAL RESISTANT SPEAKER W/ TRANSFORMER "Heavy-duty vandal-resistant and weather-resistant construction, 8-ohm or 25V (1/2 watt) operation, Call-in switch on VRS1 can be wired for ômomentaryö or ôlatchingö operation, One-way security hardware included,The Bogen VRS1 and VRS2 are vandal-resistant speakers designed for hands-free two-way communications. The VRS1 and VRS2 consist of a 3-inch, weatherresistant, cone-type speaker and 25V transformer (tapped at 1/2 watt). The transformer can be bypassed for 8-ohm operation. The speaker and transformer are mounted on a #11-gauge stainless steel face plate. The speaker is protected from harm by the face plate, a baffle plate with stamped perforations, and a grille screen. The VRS1 includes a heavy-duty metal pushbutton switch which protrudes slightly from the faceplate and can be used to initiate a call to a control center. The switch can be wired for use with systems which require a momentary contact closure for call annunciation (e.g., MULTICOM 2000), and includes a silicon-controlled rectifier circuit for use with systems which require ôlatchingö operation (e.g., Multi-Graphic)"