18KHz. Intercom: Supported, Integrated Microphone. Running Temperature level: -20 ～ 50 ℃. Measurements: 283.1 * 224.3 * 269mm. Network Ceiling Audio Speaker GEN-6211A03 Power Supply: DC 24V/1A or POE. Interaction Procedures: TCP/IP, UDP, SIP, ONVIF. Signal-to-Noise Ratio: > 80dB. Regularity Reaction: 100Hz https://troyqxupj.elbloglibre.com/29946117/selecting-the-right-ip-speaker-key-includes-to-consider