Features: Double channel balanced input: Supports 2 channel balanced sound input, ensuring stable sound signal transmission and reducing interference. Corded and wireless microphone support: compatible with both corded and wireless microphones, with wide applications and convenient use. Front amplifiers: Built in preamplifiers provide clearer and more powerful sound output effects. Flexibility: The device has highly flexibility and can adjust various sound input devices as needed. Stable: Provides stable sound amplification function, ensuring sound quality without distortion and providing quality sound output. Specifications: Material: Metal Color: black Size: about 10.8x4.2x2.7cm/4.25x1.65x1.06inch Model Name: AP20 2CH Sound Amplifier Working frequency: 20HZ-20KHZ Input impedance: single ended 10K, balanced 20K Output impedance: 200ohms Working voltage: DC5V-12V Static power consumption: 0.3W Working current: 5V-73mA, 12V-30mA Both input and output are 6.5mm, 1/4inch Package Includes: 1x AP20 Sound Amplifier 1x Cable note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.