4-way sound source selection for versatile audio input options Compact switch board size of 43.5mm x 43.5mm for easy installation Compatible with various audio sources including CD, DVD, PHONO, and AUX Equipped with LED light tube for clear gear switch indication Supports both input selection and reverse application for flexible usage Motherboard and switch cable length 30CM Relay 4-way sound source selection, audio switch, input selection board (the actual can be adjusted 1-4 way) Supply voltage single AC12-15V Motherboard size 105mm x 43.5mm The board can be selected four inputs and one output. Color: Black Material: PCB Package Contents: 1*Tone switch input selection board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.