The AtlasIED C-T4BT is a wall-mounted controller for Atmosphere audio systems that combines user control and local Bluetooth audio input in a single 2-gang device. Its 4.3-inch programmable touchscreen is designed to simplify access to zones, source selection, and user actions, while the capacitive slider provides a familiar way to adjust level from the wall. For projects that need a cleaner interface than a rack or software-only workflow, the C-T4BT offers direct, in-room operation tied to the AZM platform.

For commercial environments, the controller also adds occupancy-aware behavior through its PIR motion sensor and adapts screen visibility with automatic brightness adjustment. Integration is handled through direct connection to compatible Atmosphere AZM and AZMP processors using CAT5e cabling, with support for daisy-chained deployment over long runs. The built-in Bluetooth input allows wireless stereo or mono audio streaming from compatible devices, making it useful in meeting rooms, hospitality spaces, and flexible-use zones where guest content needs to be brought into the sound system without separate source hardware.

Because the C-T4BT includes Bluetooth audio, it occupies the single audio input accessory position available on each AZM accessory port. It is compatible with Atmosphere AZM / AZMP system processors running software version 4.5 or greater. AtlasIED also notes that Bluetooth audio on this model is not currently compatible with ChromeOS.