CTRL: Chip enable pin. The input high level is closed, and the input low level is enabled. The default internal pull-down is low level. Type: Voltage Regulator Model Number: TPA6112 & SGM4812 Application: 150mW Headphone Amplifier Board Operating Temperature: 150mW Headphone Amplifier BoardBoard Supply Voltage: 150mW Headphone Amplifier Board Dissipation Power: 150mW size:2.0 x 2.3CM Material: PCB colour: green Package Contents: 1 x Amplifier Board Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.