Output level: +6dBV ± 3dB. Frequency response: 20Hz ~ 20kHz. Amplifier: Built-in 10W Class D. Power supply: PoE (IEEE 802.3 af Type 1 Class 3), PoE+ (IEEE 802.3 at Type 2 Class 4). Internal memory: 1 GBytes. Max. sound pressure level: 99dB. Frequency range (-10dB): 120Hz~20kHz Sensitivity (1Watt): 90dB. Supported protocols: IPv4, HTTP, SIP, mDNS, DNS, NTP, TCP, UDP, DHCP, ARP, ICMP. TTS: English (US, UK), German, French, Spanish, Russian. Audio monitoring: Speaker, connection test