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 4 8 16 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 1The power amplifier supports U disk input, AUX input, and sound card input. 3 inputs are optional 2Mobile APP control Support for Android/IOS system, APP visual operation play mode 3Super compatibility, can be widely used in various tablet computers, TVs, smart phones, laptops with Bluetooth function, etc. 4With power reverse connection protection, short circuit protection, self-recovery overheating protection protection mechanism. 5Small size, easy to carry and store, convenient to use and with good performance.1 x BluetoothPowerAmplifier