Key Features - 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 - Frequency range (-10dB): 130Hz~20kHz - Sensitivity (1Watt): 91dB - Supported protocols: IPv4, HTTP, SIP, mDNS, DNS, NTP, TCP, UDP, DHCP, ARP, ICMP - TTS: English (US, UK), German, French, Spanish, Russian