WisWinDa Specialized in Audio Devices, Making Your Audio System More Professional. WisWinDa 3-Channels passive stereo xlr audio switch. This design well have two different versions, WD301A support 3 stereo XLR Input and 1 Output. Another version is WD103A which support 1 stereo Input and 3 Output. Please take the right one according to your demanding and audio system devices. The version 3-In 1-Out is designed for customers whom has several music audio sources equipments with XLR, and the version 1-In 3-Out is designed for clients whom has several audio players or amplifiers. It’s passive plug and play design very convenient in using.(Tips: 1-In 3-Out: 3 Outputs can not be working simultaneously). The audio switch box is aluminum shell design with strong quality xlr connectors which could help to avoid external nosie and keep it high quality singnal transmission. The speaker switch selecter box is a passive design which no need extra power supply, and no affect the sound quality at all. Exquisite appearance with portable size. It could be easily placed and carried to enjoy the music anytime and anywhere.