The Grandstream GSC3506 V2 is a multicast paging speaker designed to enhance security and communication in various environments such as offices, schools, hospitals, and apartments. This high-performance SIP speaker offers crystal-clear HD sound thanks to its 30-watt high-fidelity speaker. It supports SIP and multicast paging, group paging, push-to-talk (PTT), and includes whitelist, blacklist, and graylist features to block unwanted calls. Key features: - 30 W HD speaker with full-band audio - 1 10/100 Mbps port with built-in PoE/PoE+/PoE++ - USB 2.0, compatible with external USB storage devices - Support for SIP paging, multicast, and call waiting with takeover priority Product dimensions: - Width: 5 inches - Length: 10 inches - Height: 5 inches Package dimensions: - Length: 33 cm - Width: 32 cm - Height: 15 cm - Weight: 2.8 kg Color: White Included components: GSC3506 V2 multicast paging speaker Model number: GSC3506 V2 Part number: GSC3506v2 With its sleek design and advanced features, the GSC3506 V2 provides a cutting-edge security and paging solution for any environment.