ITEM NAME:DC 5V-15V AD828 Audio Preamp Power Amplifier Board Preamplifier Module Quality Descriptio n Description: 100% Brand New and High Quality Practical and durable Long service life Stable performance Small size design, all-chip production process, input and output coupling capacitor using imported non-polar brand capacitors, op amp using fever-level AD828 patch Specifications: Material: PCB Board Color: Red Size: 33mm*25mm Working Voltage: DC 5V-15V Note: The board without voltage regulation function, it is best to use a regulated power supply or battery-.Specifications:Material: PCB Board. We want to make sure you are happy with our item. Goods without RMA number will NOT be accepted. We'd like to settle any problem in a friendly manner. Color: Red.