Loudspeaker, Amplifier, Conference System manufacturer / supplier in China, offering 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, 20W 8ohms 2-Way Ceiling Speaker with 3.5\"Bass and 1\" Tweeter Passive Radiator in-Ceilingspeaker and so on.