18KHz. Intercom: Supported, Integrated Microphone. Operating Temperature: -20 ～ 50 ℃. Dimensions: 283.1 * 224.3 * 269mm. Network Ceiling Audio Speaker GEN-6211A03 Power Supply: DC 24V/1A or POE. Interaction Methods: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Ratio: > 80dB. Regularity Response: 100Hz https://zioncnubg.mybuzzblog.com/9580995/spon-communications-leading-the-way-in-innovative-ip-pa-system-designs