Feature: 1. 6.35mm Sound Amplifier: 2 channel sound amplifier with dual channel inputs and outputs, designed for having multiple sound sources and outputs, compatible with sound instruments, microphones, microphones, amplifiers, preamplifiers. 2. Inputs: The inputs are designed with balanced circuitry and can be single ended or balanced, single ended inputs with large 2 pole mono plugs, balanced inputs with large 3 pole dual channel plugs. 3. Suggestions for Use: 2 channel sound amplifier for long distance transmission can be balanced, the output port is unbalanced single ended, using 6.5mm large two pronged plug can be. 4. Dual Channel: Independent dual channel amplification, gain independent adjustment (0‑20DB), the two channels can be used individually or simultaneously, without affecting each other. Sturdy aluminum CNC chassis, beautiful and durable. 5. Working Voltage, Power Switch: Working voltage between DC 5V‑12V, independent power switch, there is a simple LED light (5V power supply can be used with a rechargeable treasure or premium charging head, poor quality charging head will have AC sound). Specification: Item Type: 2 Channel Sound Amplifier Material: Aluminum Alloy Color: Black Power Supply: DC5-12V Input Output: 6.35mm (1/4 Inch) Gain: 0-20db (Independent Adjustment) Operating Frequency: 20HZ-20KHZ Input Impedance: Single Ended 10K, Balanced 20K Output Impedance: 200 Ohms Static Power Consumption: 0.3W Operating Current: 5V-73MA, 12V-30MA. Package List: 1 x 2 Channel Sound Amplifier1 x Adapter