Bluetooth Ceiling Speakers: Independent 4 channel wall amplifier bring you stereo sound effects. The in wall amplifier allows you to stream music to a connected intercom or speaker system hassle free. Compatible with all of today's latest smart devices(iPhones, iPads, iOS & Androids Smartphones Tablets, PC, Laptops, Desktops, etc.) MIC IN /USB /AUX IN Function: The in wall amplifier features USB flash memory reader for media playback which also doubles as charging port for your devices. AUX 3.5mm audio input jack lets you connect and stream audio from external devices, The Wall plate receiver adds convenient microphone paging ability along with sample source audio control. High Durability & Superior Sound: Wide sound dispersion designed speakers easily integrate with new and existing audio systems. The 1-inch silk dome tweeter generates abundant detail and clarity, projecting a solid and focused image for all sources.