Features 1. APPLICABLE EQUIPMENT: Dual channel input and output, designed for multiple sound sources and outputs, compatible with sound instruments, microphones, amplifiers, and preamplifiers. 2. INPUT AND OUTPUT: Balanced circuit design for input, supports both single-ended and balanced input. Single-ended input uses a 6.5mm two-pole mono plug, balanced input uses a 6.5mm three-pole dual channel plug. Supports balanced transmission for long distances and unbalanced for short distances. Output is unbalanced single-ended via 6.5mm two-pole plug. 3. DUAL CHANNEL: Independent dual channel amplification with gain adjustable from 0 to 20dB per channel. Channels can be used separately or simultaneously without interference. 4. DURABLE DESIGN: Sturdy aluminum CNC-machined chassis, durable and aesthetically pleasing. Operates on DC 5V to 12V with an independent power switch. Includes a simple LED indicator. Compatible with power banks or high-quality 5V power adapters (low-quality adapters may introduce AC noise). 5. EASY TO USE: Equipped with 6.35mm input and output jacks for straightforward connection and operation. Connect your devices and adjust volume for immediate amplification. Specification Item Type: Sound Amplifier Product Material: Aluminum Alloy Color: Black Power Supply: DC 5V to 12V Input and Output: 6.35mm (1/4 Inch) Gain: 0 to 20dB (Independent Adjustment) Operating Frequency: 20Hz to 20kHz Input Impedance: 10k Ohms (Single Ended), 20k Ohms (Balanced) Output Impedance: 200 Ohms Static Power Consumption: 0.3W Operating Current: 73mA at 5V, 30mA at 12V Size: Approx. 10.8 x 4.2 x 2.7cm / 4.3 x 1.7 x 1.1in Package List 1 x Sound Amplifier 1 x USB Power Cable Note: All data are measured manually and may contain slight measurement variations.