The A-1 is a high performance desktop microphone for professional Public Address installations. It has lighting indicators in order to show active state, line busy or permission-to-speak granted.

Thanks to its internal microcontroller, it is able to work under different systems and with different operational modes: on/off button, push to talk button, RS-485 communication or TTL through 2 wires, advise-tone to initiate/cut communication and TTL control level selection