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Specification: Amplifier board size: 1.9x2.3CM Voltage: 2.3 ~ 5.5V DET: Headphone plug in the detection foot. After inserting the headphone output low, not inserted high output. CTRL: chip enable pin (usually connected to the Bluetooth module MUTE). Input low off, input high enable. The default internal pull-up is high. Package included: 1 x Amplifier Board