The Dahua VCS-SH30 is a 15 W network horn speaker suitable for public announcement, broadcasting, and sound management applications. It features the following capabilities: - **PoE+ (IEEE 802.3at)** and DC24V power options - Built-in microphone for two-way audio - ONVIF and SIP support - 512 MB internal memory with TF/microSD extension capability - Web-based management and group platform management - 15 W electronic amplifier with an 8 Ω horn speaker Its construction is made from aerospace-grade aluminum and has an IP67 and IK10 rating for outdoor use. It supports MP3, G.711, and G.722 audio formats and is intended for applications such as networked public announcements, voice alarms, and integration into video surveillance systems. Physical dimensions are not specified by the manufacturer in the basic technical specifications.