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. Interaction Procedure: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Regularity Response: 100Hz https://alexismeuhy.digitollblog.com/29768934/spon-communications-leading-the-way-in-ingenious-ip-pa-system-designs