16KHz. Running 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 Ratio: > 80dB. Regularity Feedback: 100Hz https://free-sound-effects49360.life3dblog.com/29275268/discover-the-advantages-of-using-an-ip-speaker-for-clearer-announcements