1. This Machine Is Suitable For Audio Equipment Such As Sound Cards Or Power Amplifiers With Microphone Interfaces, Active Speakers, Mixers, Etc. 2. It Has Three-Stage Equalization Adjustment For High, Middle And Bass, 20db Gain Amplification, Alc Automatic Gain Circuit, Low Power Consumption And Long Battery Life. 3. Support Dynamic Coil, 5v Condenser Microphone, Electret Or Battery-Installed Condenser Microphone. 4. Does Not Support 48v Condenser Microphone; 5. Built-In Lithium Battery, It Can Be Used Continuously For 10 Hours On A Single Charge; Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Gain, 0-20DB Adjustable; Charging Interface: Type C Input And Output Interface: 6.5mm, 3.5mm; Size: About 115mmx71mmx33mm (LengthxWidthxHeight) Colour:As Shown Material:ABS Package Contents: 1x Sound Card Amplifier 1x Charger 1x 6.5mm Audio Cable 1x 3.5mm Audio Cable 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.