Speaker, Audio manufacturer / supplier in China, offering VoIP 20W Waterproof Outdoor Active Poe TCP/UDP SIP Network Projection Wall Mounted Speaker for PA Public Address System, Dante Network Multi-Zone Paging Microphone with Built-in DSP and 10 Inch Touch Screen, Onvif VoIP 60W Waterproof Active Poe TCP/UDP IP Network Wall Mounted Speaker with Built-in Microphone for Outdoor Audio System and so on.