18KHz. Intercom: Supported, Integrated Microphone. Running Temperature level: -20 ～ 50 ℃. Dimensions: 283.1 * 224.3 * 269mm. Network Ceiling Audio Speaker GEN-6211A03 Power Supply: DC 24V/1A or POE. Interaction Methods: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Ratio: > 80dB. Regularity Action: 100Hz https://dallasrqonm.blog-ezine.com/30064396/discover-the-benefits-of-using-an-ip-speaker-for-clearer-announcements