This power amplifier is compact, easy to carry, and simple to use, dual channel stereo sound, without compromising sound quality. Features: Supports BT wireless connection. Fine quality encoder knob 360 stepless tuning. Large heat dissipation area, ensure high power and high performances operation. Protections against overvoltage, undervoltage, clipping, short circuit, overheating, etc. Comapct size for easy carrying. It can be controlled through the mobilephone app and the remote controller(included), making the operation more convenient and quick. Note: The product needs to be self assembled. Specifications: Color: black Material: metal BT: 5.1 Output impedance: 4-8 Output power: 50W+50W Remote battery: 1 * CR2025, 3V, 150mAh Item size: 90 * 52 * 24mm / 3.5 * 2.0 * 0.9in Item weight: 108g / 3.8ounce Package size: 120 * 80 * 40mm / 4.7 * 3.1 * 1.6in Package weight: 200g / 7.1ounce Packing List: 1 * Power Amplifier Main Board 1 * Upper Cover Board 1 * Lower Cover Board 1 * Knob 4 * Short Connect Rod 4 * Long Connect Rod 8 * Screws 1 * DCplug 1 * Screwdriver 1 * Remote Controller