18KHz. Intercom: Supported, Integrated Microphone. Operating Temperature: -20 ～ 50 ℃. Dimensions: 283.1 * 224.3 * 269mm. Network Ceiling Audio Speaker GEN-6211A03 Power Supply: DC 24V/1A or POE. Communication Protocols: TCP/IP, UDP, SIP, ONVIF. IP Speaker Signal-to-Noise Proportion: > 80dB. Frequency Reaction: 100Hz
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Electronic toll collection – on toll streets, an alternative choice to guide selection of tolls in a toll booth, through which a transponder within a auto, when triggered by a roadside transmitter, transmits a sign to the roadside receiver to register the automobile's use of the road, enabling the owner for being billed for that toll.[one hundred