16KHz. Running Temperature level: 0 ～ 45 ℃. Dimensions: 144 * 144 * 34.1 mm. Network Horn Audio Speaker GEN-6391A03 Power Supply: DC24V/2.7 A or POE. Interaction Method: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Ratio: > 80dB. Frequency Response: 100Hz https://opticalnearme10200.thekatyblog.com/29172936/how-an-ip-paging-system-boosts-emergency-solution-in-workplaces