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 AlloyGain: 0 to 20db (Individually adjustable)Operating Frequency: 20HZ-20KHZInput Impedance: Single End 10K, Balanced 20KOutput Impedance: 200Operating Voltage: DC5V-12VStatic Power Consumption: 0.3WOperating Current: 5V 73MA, 12V 30MAInput/Output: 6.35mm (1/4 inch).Package List:1 x Amplifier1 x USB Power CableNote:5V power supply can use power bank or quality charger, poor quality charger may have AC noise.