This model of POE speaker is installed on the ceiling, built-in POE amplifier, with gain, equalization, pressure limit, noise gate, mute control adjustment. The speaker only needs to connect a network cable to realize audio, power supply, DSP configuration and real-time signal control, compatible with 802.3af, compatible with 802.3at, natural convection heat dissipation. Ceiling speakers are widely used at Office buildings, hotels, and shopping malls are public places that use ceiling speakers.