The Ticket Window Intercoms(s) shall be Alpha Haven SC-100HG-L. The Ticket Window Intercom(s) shall be made of heavy-duty Aluminum and shall be designed to mount directly into a 3.25" to 3.50" diameter window partition opening (or larger opening with associated adapter plate/ring). Unit(s) shall feature a built-in gooseneck microphone (at operator side), as well as controls for Listen volume, talk, volume, on off switch, charger socket (on battery unit) and Power On LED. Contractor shall observe all local and national electrical and building codes.