XH-A105 Bluetooth 5.0 TDA7498 Digital Amplifier Board 2x100W Stereo Audio AMP Module Support TF Card AUX This digital power amplifier board delivers high-fidelity, two-channel stereo sound quality. Input voltage is DC 12-30V. Audio input supports Bluetooth, TF card, and AUX 3.5mm audio line input, allowing direct connection to mobile phones, MP3 players, and other devices. The amplifier board features a volume adjustment function via a rotary potentiometer: turn clockwise to increase volume and counterclockwise to decrease. Product Name: Two-channel Bluetooth 5.0 power amplifier board Input Voltage: DC 12-30V Amplifier Chip: TDA7498 Output Impedance: 4-8 ohm speaker Supported Formats: FLAC, APE, MP3, WMA, WAV Current: 3A Output Power: 100W x 2 Audio Input: Bluetooth, TF card, AUX Number of Channels: 2 Dimensions: 92 x 85 x 10mm Installation Hole Diameter: 3mm Mounting Hole Distance: 85 x 5 x 78.5mm Bluetooth Operation Instructions: When the amplifier board is powered and Bluetooth is not connected, the Bluetooth indicator flashes. Once the Bluetooth connection is established, the indicator stops flashing. During music playback, the Bluetooth indicator flashes slowly. Notes: 1. Connect the power input to a DC 12-30V power supply. Upon powering on, the red power indicator lights up and the blue light flashes. 2. Connect the audio input to an audio source such as an MP3 player, mobile phone, computer, or TF card. 3. Connect the audio output to a speaker, ensuring correct polarity (positive and negative connections). Bluetooth / TF Card Volume Control: When using Bluetooth or TF card as the audio input source, connect the control wires to the "+ VOL -" three pins to adjust volume and change tracks. - Connect "+" and "VOL": short press to play previous song, long press to increase volume - Connect "-" and "VOL": short press to play next song, long press to decrease volume Color: As shown Material: Electronic components Package Contents: 1 x Digital amplifier board (Other items not included) Note: Lighting effects and monitor differences may cause slight variations in color between the image and the actual product. Measurement tolerance: +/- 1-3cm.