Features: TL072 OP amplifier High Impedance Preamp delivers pristined auditory amplification with 1MΩ input impedance, low noise design, and wide frequency response for guitars, bass, and studio grade processing. Featuring adjustable gains control and compact PCB/metal construction, this preamplifier seamlessly integrates into pedalboards or rack systems while maintaining integrity across 20Hz 20kHz frequency ranges. Ideal for musicians, auditory engineers, and studio technicians requiring professional boosting for electric instruments, microphones, or line auditory equipment. Perfect for live performances, recording, or home studios where noise less amplification and precise control are critical for capturing authentic instrument characteristics. Engineered with industry standard TL072 double operational amplifiers, this high impedance auditory device ensures compatibility with effects pedals, mixers, for versatile chain customization. Specifications: Component: PCB+metal PCB base size: 45x30mm/1.77x1.18in Frequency ranges：20Hz 20kHz Suitable for auditory amplification of guitars, basses and other musical instruments to provide players with a better sound quality experience. Package Includes: 1PC TL072 op amplifier high impedance preamplifier note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution