Dema Electronics and Sound Ltd. ( Leilotto ) was found in 1989. Specializes in research, developing, manufacturing, sales and technical services in pro audio & KTV audio equipment.

Early since 1996, when most of Chinese entertainment place & event providers were still enjoy using well-known European or American PA system, DEMA had awarded that Chinese PA system would became global trend in marketing PA industry. After years effort, DEMA has became one of the leading PA manufacturers in China.

Some people might say DEMA starts its growing by manufacturing KTV equipment, yes, but they just right a half, the first Professional Sound System of DEMA was RV12/15/215/218 series, which was launched in 1997 yet it still one of the flagship line of DEMA.