16KHz. Operating Temperature level: 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://radio56602.slypage.com/30476091/discover-the-perks-of-using-an-ip-speaker-for-clearer-announcements