All metal shell: sturdy metal appearance design, fully enclosed internal structure, ensuring stable circuit operation, suitable for studio recording Transistor amplification circuit: Adopting class A amplifier circuit design, paired with high-order transistors Created MP5+with lower ear output impedance and stronger load capacity The speaker amplifier can provide a pure gain of 28DB without affecting sound quality Due to different batches, the appearance, color, and printed words of the product may be different, which does not affect the use. Colour:Black Material:Metal Package Contents: 1 * Amplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.