18KHz. Running Temperature: -20 ～ 50 ℃. Dimensions: 193x151.5 x292mm. Network Column Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Communication Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 90dB. Regularity Reaction: 45Hz https://johnathanwnuaf.thezenweb.com/streamline-your-announcements-with-a-high-quality-ip-paging-microphone-67811145