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Check the listing for details. 2.1CH HiFi Bluetooth5.0 Digital Power Amplifier Subwoofer Audio Amp Board Module. Condition: New. Listed at 24.15 USD. Rosin Atomizer Pen Motherboard Short Circuit Detector Rosin Pen Fast Detection. High quality amplifier board. With AUX and Bluetooth two kinds of audio input, two in one, 5.0 Bluetooth version, higher transmission efficiency and longer transmission distance.