Multi-functional knob design for easy volume and playback control, with long-press button for power on/off. Supports Bluetooth-compatible 5.1 technology for wireless playback from mobile phones, tablets, and other devices. Features 3.5mm AUX input jack for connecting TVs, computers, and USB input for direct music playback. Made with aluminum alloy oxidation process for durability and wear-resistance, with elegant design. Equipped with remote control functions, APP or infrared remote, and built-in multiple protection mechanisms for reliable and stable use. Item Name: Amplifier Board Material: Aluminum Alloy Model: XY-X15H XY-X15H Bluetooth-compatible Version: 5.1 Audio Input: Bluetooth-compatible, AUX, USB, USB Flash Drive USB Flash Drive: WAV, FLAC, APE, MP3 Output Power (Left And Right Channels): 2*10w @ 8/12v; 2*20w @ 4/12v; 2*15w @ 8/16v; 2*20w @ 8/24v Protection Mechanism: Overvoltage, Overcurrent, Undervoltage, Short Circuit, Overheating Remote Control Function: APP, Infrared Remote Control Size Details: L: 7.8cm/3.07", W: 5.2cm/2.05", H: 3.5cm/1.38" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Amplifier Board 1 x RCA Cable 1 x AUx Cable 1 x Remote Control (Not Included Battery)