Loudspeaker, Amplifier, Conference System manufacturer / supplier in China, offering Ben & Fellows 6 Inch Two-Way Ceiling Speakerhigh Cost Effective PA Audios 15W at 100V 60W at 8 Ohms Passive Metal Shell Speaker, SIP Onvif Network Horn Speaker 30W Waterproof IP66 with Built-in Mic for Emergency Notification, SIP-Enabled IP Speaker with Poe/DC for Indoor & Outdoor Emergency Alert and Paging Use and so on.