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28DB gain class A transistor amplifier circuit noise floor, effectively fixing the difficulty of low volume attributable to low sensitivity of dynamic microphones Due to assorted batches, the appearance, color, and printed phrases of the product could also be different, which does not impact the use Material: Metal colour: Black Package Contents: 1 x Amplifier Only the above equipment content, different merchandise shouldn't included. Note: Light mirrored image and varied exhibits could cause the colour of the article in the photograph a little varied from the genuine thing. The dimension allowed error is +/- 1-3cm.