25W+25W TDA7492P 4.0Audio Compatible-Bluetooth Receiver Digital Amplifier Board Features: Sound quality is very good by using this module Equipped with AUX interface Using CSR8635 Bluetooth chip,Compatible-Bluetooth V4.0,high software compatibility After power on,automatically enter into pairing mode,search the name:SANWU Audio With 5 buttons for adjustment,convenient and easy operation Applicable speaker impedance:4/6/8/16 ohm(8 ohm is the best) Specifications: Supply Voltage:DC 8-25V Power Interface:2.1 DC Socket Audio Input:Compatible-Bluetooth Receiver V4.0 Audio Output:Terminals Output Power:Add Pre-5532 Output Foot Applicable Speaker Impedance:4/6/8/16 ohm Package includes: 1*Compatible-Bluetooth 4.0 Audio Power Amplifier Board Note: Only the above package products are included,no case If you use external audio,you need connect 3.5mm audio line If you directly use Bluetooth,when power on Wait 3-10s,until LED blue and red light flashing alternately Then you can use your device to find the Bluetooth module then connect it You can directly use it