Railtones is a wireless speaker system that incorporates lighting and sound in one unit. Powered by the company’s 12- or 24-volt FreeJack or MonoRail system, it uses a USB transmitter that plugs into a computer to transmit sound. The kit includes two speakers, wireless transmitter, infrared remote control, power adapter, and audio cables. Cost: $599. Tech Lighting. 847-410-4400. www.techlighting.com.