Hi-fi businesses sell equipment for listening to recorded music and other audio in the home or workplace. Their products commonly include stereo amplifiers, receivers, turntables, CD players, network streamers, speakers, headphones, radio tuners, cables and accessories. Some stock new and second-hand equipment, and may offer demonstrations so customers can compare components and consider how they work together. Services can include advice on choosing and matching equipment, assembling systems, delivering and installing components, and setting up speakers or connected audio devices. Some businesses also provide servicing and repairs, arrange upgrades, or buy and sell used equipment. The range varies: a specialist retailer may focus on separates and high-quality stereo playback, while others offer compact systems, home cinema equipment or multi-room audio. Hi-fi businesses are distinct from general electronics retailers through their focus on audio components and system compatibility.