18KHz. Running Temperature level: -20 ～ 50 ℃. Dimensions: 193x151.5 x292mm. Network Column Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Interaction Method: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 90dB. Regularity Response: 45Hz https://marcodxixi.blog4youth.com/30524403/improve-your-announcements-with-a-top-quality-ip-paging-microphone