The Optical digital selector DN-DO31S from Evergreen Corporation allows you to connect three optical digital voice equipments like DVD player, CD player and satellite broadcast tuner to an AV amplifier at a time. You can select the equipment you want to listen with the knob. With the lock mechanism sudden change is prevented. The Optical digital selector has three Optical digital angular outputs and one optical digital angular input.

The selector works without any external power. The audio selector measures115×145×23mm, weighs 100g and costs approximately 1,980 Yen ($17).
Via Evergreen (Japanese)