Features 1.The power amplifier supports U disk input, AUX input, and sound card input. 3 inputs are optional 2.Mobile APP control Support for Android/IOS system, APP visual operation play mode 3.Super compatibility, can be widely used in various tablet computers, TVs, smart phones, laptops with Bluetooth function, etc. 4.With power reverse connection protection, short circuit protection, self-recovery overheating protection protection mechanism. 5.Small size, easy to carry and store, convenient to use and with good performance. Specification Item Type: Bluetooth Power Amplifier Material: Aluminum Color: Blue Model: XY-KA15H Supply Voltage: DC8-24V (the higher the voltage, the greater the output power) Output Power: 20W Channel: 2 channels Bluetooth Version: 5.0 Cool Function: Support Sinilink-APP control Input Mode: Bluetooth + AUX + U disk + USB sound card Volume Adjustment: Encoder volume adjustment, smoothly feel, one-key switch Transmission Distance: Approx. 15meter / 49.2ft (unobstructed) Number of Channels: Left and right dual channels (stereo) Adapted Speakers: 10W-200W 4Ω 8Ω 16Ω Protection Mechanism: Power reverse connection protection, short circuit protection, self-recovery overheating protection Size: Approx. 12mm / 0.5in 50mm / 2in 22mm / 0.9in 7mm / 0.3in 77mm / 3in Package List 1 x Bluetooth Power Amplifier