1. Humanized design. Slide the knob to adjust the sensitivity, tool-free operation, built-in plug-and-play audio socket, easy to use. 2. Good display effect. The 6e2 cat-eye tube has high sensitivity and uniform brightness when displayed. The product has a built-in amplifier circuit, and the volume changes are clearly visible; left, right channel or stereo mode can be . 3. Optimized sound quality. Supports treble attenuation function, bass and d rhythm, and displays more agilely, suitable for a variety of music styles. 4. Complete accessories. USB 5V power supply, complete accessories, ready to use out of , free audio cable and charging cable. 5. Stable operation. Built-in 6.3V filament drive circuit, stable voltage, extended tube life, long-term stable operation. 6. Easy to use. Built-in pickup, no need to use audio cable external devices. Parameters: Level tube type: 6E2 cat's eye level Working voltage: 5V Left/right channel switching: Supported Pickup: Supported Overall size: 86 x 82 x 49mm Colour: parent Material:ABS+GLASS Package Contents: 1 * Driver board 1 * 6E2 tube 1 * Audio cable 1 * USB power 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.