Product: Bluetooth Digital Amplifier Module Operating Voltage: DC: 8 ~ 24V Bluetooth Version: 5 Transmission Distance: 15 meters (line of sight); Number of Channels: Stereo Power (@1KHz): 16W*2@12V 4 ohm; 10W*2@12V 8 ohm; 15W*2@16V 8 ohm; 20W*2@20V 8 ohm; 30W*2 @ 24V 8 ohm (requires heatsink); Speaker Adapter (30W~150W) 4 ohm (8~12V power supply); 8 ohm (8~24V power supply); 16 ohm (8 ~ 24V power supply). Module Protection Mechanism: Reverse polarity protection, short circuit protection, automatic reset overheat protection. Instructions: After power on, the blue light flashes rapidly, entering Bluetooth mode. After "pairing tone" is played, it enters pairing mode for connection. The portable Bluetooth searches for "XY-P15W" (from the device's amplifier board) and connects. After a successful connection, "connection tone" is played, and the indicator light stays on. You can then play music from your mobile device; the indicator light slowly flashes while playing music. When Bluetooth is disconnected, the amplifier board prepares for the next pairing and plays "pairing tone" to enter pairing mode, waiting for connection. Color: Black Material: Plastic + Metal Package Contents: 1 * Module Note: To enhance module performance, it is recommended to operate the amplifier with a heatsink when the application scenario exceeds 20W*2. Only the above package content is included; other products are not. Note: Light photography and different displays may cause the color of the item in the picture to differ slightly from the real item. The allowed measurement error is +/- 1-3 cm.