1. Made of high-quality materials, and practical 2. Support to form a wireless pair box, instantly becoming a left and right channel stereo sound system 3. Supports MP3/WMA and WAV/FLAC/APE lossless formats 4. The Bluetooth name of the product can be changed, making it easy to identify multiple products 5. Wide application range, suitable for 4-8 ohms, 5-30W speakers Model:-301B Name:Mono 30W Bluetooth Audio Amplifier Board Module Bluetooth version:5.3 Bluetooth transmission distance: 15 meters Audio input:Bluetooth+AUX+USB drive+USB sound card Audio output:Mono 30W Adapted power supply:DC9-24V, 3A (cannot be connected to AC power) Adapted speaker:4-8 Ω, 5-30w Total volume with button: Click: Play/Pause Double click: Next track Three strikes: Enter or exit mode Long : switch on/off Protection mechanism: input anti reverse connection, over temperature, over current, short circuit, anti-static protection Featured feature: Support for APP. Modify Bluetooth name, password settings, volume adjustment of prompt tone, on/off prompt tone, sleep aid song, firmware upgrade, etc; The speaker pairing function and true wireless function enable two sets of speakers to be combined into left and right channel speakers, providing a stronger sense of spatial positioning. Attention: If using a 4 Ω speaker, please use a 12V power supply. If the voltage is too high, it be . Note:due to different printing batches, if there is a slight difference in words, it not affect the use. Color:Black Material:PCB+Metal Package Contents: 1 * Audio amplifier board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.