16KHz. Running Temperature level: 0 ～ 45 ℃. Measurements: 144 * 144 * 34.1 mm. Network Horn Speaker GEN-6391A03 Power Supply: DC24V/2.7 A or POE. Communication Procedure: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Proportion: > 80dB. Regularity Response: 100Hz https://cheapprescriptionglasses05826.blogmazing.com/29476783/discover-the-conveniences-of-using-an-ip-speaker-for-clearer-announcements