The VPP is designed to deliver high-quality audio performance, supporting POE power supply per IEEE 802.3at standard and SIP protocol. Key features include built-in decoding and amplifying circuits, CD-quality output, and automatic online connection. It supports timing synchronization, accessing LAN through RJ45 with 100 Mbps bandwidth, and automatic program synchronization between terminals and servers. The VPP speaker operates in both online and offline modes, supporting unicast, multicast, and broadcast in LAN. It offers 15W rated power for the main POE speaker and an extension speaker, with support for 0V, 24V signal control, and stereo audio input. The system supports emergency broadcasting, all audio formats of Windows, VLAN or 3-layer routing use, and user management with easy-to-use interfaces. Other features include low standby power consumption (<0.3W), network delay (<50ms), and robust protection functions. It offers rapid restart recovery time (<1 second), supports TCP UDP, and provides reliable audio playback with minimal delay.