detail: Hint: this is assembled - For the operation and usage instructions of the spectrum, please see the following function operation video, no instructions! - Function operation video: player.youku.com/player.php/sid/XMTcxNjcxODA5Mg==/v.swf - 16-segment audio spectrum display PCB size 176*50mm, LED size 167*41mm. - The thickness of the flattened PCB board is 14mm, the thickness of the LED module is 8mm, and the total thickness is 22mm. Size: narrow screen 150*34mm, wide screen 160*40mm important: 1. The module is green, the power supply is DC 5V/600MA, the maximum brightness of the whole board does not exceed 600MA, and the USB power supply with an output current greater than 600MA can be used. 2. The "BG" printed on the module is green, and the printed pins are + pole, corresponding to the "+" on the board. 3. Equipped with 33 green modules, one more for spare. 4. Pay special attention to the color and polarity of the LED module when welding. Be sure to remember the first row of pins, the LED module corresponding to the electrode position, and the LED module position to be soldered last. feature: 1. Support 32Hz-20KHz precise frequency sweep, and make reasonable channel settings within the range of 10Hz-20KHz. 2. Display flip function, 16-level brightness adjustment. 3. The spectrum of main landing speed, peak hold time and descent speed can be adjusted individually. 4. With smooth display and bottomless display mode, excellent AGC processing. Make the signal display richer. 5. Using a professional constant current driver chip with blanking, the LED light has no problem of light and dark flickering. Package Included: 1PC*LED Audio Spectrum DIY Kit For the operation and usage instructions of the spectrum, please see the following function operation video, no instructions! Function operation video: player.youku.com/player.php/sid/XMTcxNjcxODA5Mg==/v.swf 16-segment audio spectrum display PCB size 176*50mm, LED size 167*41mm. The thickness of the flattened PCB board is 14mm, the thickness of the LED module is 8mm, and the total thickness is 22mm.