The CSBT80 is a set of 2 ceiling speakers, 1 with built-in amplifier and 1 passive that can be connected to the active speaker. The BT-receiver is ideal for streaming your music wireless to the speakers.The high-quality and easy fit-in ceiling speaker is suitable for installation in almost any material. The ceiling speakers will provide a clear and warm sound and haves a build-in tweeter. Ideal for use in your living room, workspace, garage, showroom, restaurant etcetera.