Wide voltage design, suitable for harsh industrial environments

Speaking prior to alarm

Continuously adjustable volume

Three selectable alarm tones, customized voice

Three selectable power levels, configurable with one or two speakers.

Power-off memory

Compact design, suitable for cabinet installation

Easy to operate, responsive

Optional foot switch for hands-free broadcast

The AS21 series is a versatile and compact alarm device host, designed to work with Nanhua microphones and speakers. It is suitable for industrial scenarios that require efficient amplification and area alarms, such as port machinery, large mobile equipment, and driver cabins of engineering vehicles.