Boston, MA, United States — February 4, 2026 — Grandstream, connecting the world with unified communications and networking solutions since 2002, announces an outdoor horn speaker. The GSC3518HS is a two-way SIP/multicast speaker that delivers clear HD audio, a 50 W high-fidelity speaker, and IP66 protection against water and dust. It is suitable for outdoor campuses, public spaces, large offices, schoolyards, hospitals, parks, warehouses, and other sites that need powerful announcements.
The GSC3518HS uses a 50 W speaker capable of reaching 126 dBA. It integrates three microphones, AI-powered ambient noise reduction, and intelligent speech synthesis to keep two-way conversations intelligible. It supports SIP and multicast paging, priority-based call holding, and other announcement features.
- Supports full-band and wideband audio codecs, including Opus and G.722.
- One 10/100 Mbit/s network port with PoE/PoE+/PoE++ input and one 10/100 Mbit/s port with PoE/PoE+ output.
- Differential LINE IN and LINE OUT connections.
- IP66 protection against water and dust, with a stainless steel bracket suited to harsh outdoor environments.
- Supports AirPlay, ONVIF, RTSP/HTTP streaming, local audio files, and playback from a mobile app.
Product resources
See the local GSC3518HS product page for technical resources.
Availability
The GSC3518HS is available now through Grandstream’s global distribution partner network.