Hifi Remote Relay RCA Volume Control Board Passive Preamp Board Audio Input Choose The product comes with RCA terminals by default. If you do not need them, please contact us. Product Details: Features: pure resistance circuit, fixed input resistance, no noise, encoder + MCU control data, no sound size jump. Encoder / remote control volume control, sound source selection. One click mute. One click volume return (return to the default volume you set). You can set the default volume size (the value returned by turning on or pressing one key). The volume limit protection can be set (i.e. no higher than the value you set). Four channel input selection, two channel output selection and simultaneous output. (automatic memory after selection) With remote control switch other equipment functions, such as front stage, power amplifier, etc. Volume, input selection and output selection all have automatic memory function. The balanced volume control system can be realized by the combination of two volume relay boards and two sound source switching boards, that is, one board is used for the balance control of one channel. Works voltage : AC220V-AC240V. (we also can provide 110V version) Volume board resistance : 10K/50K/100K for choose Display text color: default is white. Package List: 1 set Remote control volume control board (as the picture shows)LCD1602 The remote not included battery