16KHz. Operating Temperature level: 0～45 ℃. Measurements: 144 * 144 * 34.1 mm. Network Paging Console XC-9037N Power Supply: DC12V/1.5 A. Show: 4-inch touchscreen, resolution 480 * 480. Interaction Methods: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 80dB. Frequency Reaction: 100Hz https://speakers42996.blogdun.com/30568598/just-how-an-ip-paging-system-improves-emergency-solution-in-workplaces