Feature: 1. Balanced Input Design: Featuring a balanced input circuit, this sound amplifier allows for both single ended and balanced input options, with single ended input using a large two core mono plug and balanced input using a large three core stereo plug for long distance transmission. 2. Variable Working Voltage: Operates between DC 5V to 12V, with an independent power switch and simple LED indicator for easy power management and monitoring. 3. Independent Dual Channel Amplification: Equipped with dual channel amplification with separate gain adjustments (0 to 20dB), each channel can be used individually or simultaneously without affecting each other. 4. Versatile Output Ports: Output ports are non balanced single ended, utilizing 6.35mm (1/4 inch) ports for both input and output connections, ensuring compatibility with a wide range of sound devices. 5. Wide Application: Ideal for amplifying microphones, instruments, music signals, and other sound applications requiring amplification, providing clear and powerful sound reinforcement for various sound needs. Specification: Item Type: Dual Channel Sound Amplifier Material: Aluminum Alloy Gain: 0 to 20db (Individually adjustable) Operating Frequency: 20HZ-20KHZ Input Impedance: Single End 10K, Balanced 20K Output Impedance: 200Ω Operating Voltage: DC5V-12V Static Power Consumption: 0.3W Operating Current: 5V 73MA, 12V 30MA Input/Output: 6.35mm (1/4 inch). Package List: 1 x Amplifier 1 x USB Power Cable Note: 5V power supply can use power bank or quality charger, poor quality charger may have AC noise.