16KHz. Operating Temperature level: 0 ～ 45 ℃. Dimensions: 144 * 144 * 34.1 mm. Network Horn Speaker GEN-6391A03 Power Supply: DC24V/2.7 A or POE. Interaction Procedure: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Frequency Reaction: 100Hz https://powerline78552.bloggerchest.com/29904174/spon-communications-blazing-a-trail-in-cutting-edge-ip-pa-system-designs