Alpha TT33-3 QwikBUS Panel Speaker / Microphone Unit

Deploy clear, reliable entry audio and simplify access control with the Alpha Communications TT33-3 QwikBUS Panel Speaker/Microphone unit. Designed for intercom and entry accessories in apartment lobbies, office entryways and secured access points, this compact unit powers from the SP333 QwikBUS intelligent controller so no additional power supply is required in most configurations. The TT33-3 includes a built-in door release relay (compatible with conventional pushbutton stations when used with a T1240 12VAC transformer), adjustable voice volume, and high-fidelity half-duplex voice communications for secure, intelligible exchanges at the door. Engineered for durability, the PC boards are chemically treated to resist moisture and the device operates on Class II low-voltage wiring for safer installation. Install the unit discreetly behind standard lobby faceplates and expand to multi-station setups with the plug-in E32 2-wire extender connector. Whether you're specifying an access control upgrade, improving building security monitoring, or adding intercom functionality to a surveillance entry system, the TT33-3 provides a dependable, easy-to-install solution. Specify the Alpha TT33-3 for your next security or access control project and contact your supplier to order.

• Seamless integration with QwikBUS systems — powers from the SP333 controller so no separate power supply is required
• Built-in door release relay simplifies access control wiring and supports conventional door openers (use T1240 transformer where required)
• Adjustable volume and high-fidelity half-duplex audio for clear, reliable visitor communications
• Compact, behind-panel mounting preserves lobby aesthetics and installs easily into standard pushbutton entry panels
• Moisture-treated PC boards and Class II low-voltage design for dependable performance in entry and outdoor environments
• Plug-and-play connector for E32 32-station 2-wire extenders to scale multi-station intercom systems