16KHz. Running Temperature: 0 ～ 45 ℃. Measurements: 144 * 144 * 34.1 mm. Network Horn Speaker GEN-6391A03 Power Supply: DC24V/2.7 A or POE. Communication Method: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Frequency Response: 100Hz https://powerline68654.blogpixi.com/30271900/picking-the-right-ip-speaker-trick-features-to-think-about