Features:brand new and high qualityThe higher the supply voltage, the greater the output power. The smaller the impedance of the speaker, the greater the output power!Independent adjustment of treble and .Binaural stereo output gives you a different experience.Advanced circuitry design, built-in speakers for protection circuit, best for bookshelf/computer/desktop/speakers in your home.An external antenna can be connected, and the antenna can be purchased by yourself. Specifications:Power Supply: for DC 12~24 V / 5A or above (Do not connect to 24 V battery pack)Adapter Speaker: 30~200 for W,4~8 Power Supply Voltage: 12V-----8/20W+20W, 4/35W+35 19V-----8/35W+35W, 4/60W+60W 24V----8/50W+50W, 4/100W+100WAudio Input: BT+AUXPower:100Wx 2Heat Sink:36x25x10mm Heat SinkProtection:Overheat, Overcurrent, Short CircuitSize:9.9x 6x2.1cm/3.89x2.36x0.82inchesPackage Weight:122gMaterial:ABS+Alloy Note:Please allow an error of 0-3mm due to manual measurement. Monitors are not calibrated same, item color displayed in photos may be showing Package includes:1 x Mini Audio Amplifier