16KHz. Operating Temperature: 0 ～ 45 ℃. Dimensions: 144 * 144 * 34.1 mm. Network Horn Audio Speaker GEN-6391A03 Power Supply: DC24V/2.7 A or POE. Communication Procedure: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Regularity Feedback: 100Hz https://surroundsoundsystem44468.theisblog.com/30203745/spon-communications-blazing-a-trail-in-innovative-ip-pa-system-designs