Advantages of OLED screen:Low power consumption and high brightness;Actively illuminated, visible in the sun; Compared with ordinary LCD screens, OLED has a faster response speed; to high and low temperatures, more suitable for cars; The light is soft and not dazzling, unlike LED which is too bright and seriously affects driving safety; OLED is more vibration- and than VFD (vacuum screen); inch Make music visible inch , 3 inch OLED music spectrum display module, Supports 8 display effects (switchable by buttons), supports time display, temperature/humidity detection, and supports computer hardware monitoring. Length*width*height=105x20x35mm Power supply voltage: 5V /1A Audio input: Lessthan 2V Spectrum range: full audio range (20HZ-20KHZ) Because the frequency of the mobile phone is similar to the refresh frequency of OLED, the video flickers, but there is no flickering when the human eye sees it. Colour:Green Material:plastic Package Contents: 1 * Music spectrum display 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.