Audio to accompany IP video camera installations is often overlooked, yet live audio call out messages are extremely effective in regards to safe guarding your site. Burgess Technologies pre-builds an outdoor ready 40 Watt VoIP Loud Speaker System. No telephone line is required on site, our audio warning system needs the internet to operate. This specific system requires a network on site to plug into. Available as an upgrade is our 4G 40W Loud Speaker System.