The B-01F is an input module for use with TOA 900 series amplifiers. It has an XLR female connector and supports line level signals. It can accept balanced or unbalanced equipment such as CD players, tape decks, or AM/FM tuners. The unit is transformer-isolated to minimize ground loop problems when connected to remote equipment. Simply plug the B-01F into the module slot on your 900 series amplifier and you're instantly ready to connect a line level XLR input.