Three-stage 10-point voice-activated level indicator kit (blue, green, red 5mm high-brightness LED), including more than 200 components and 443 solder joints, is a relatively challenging soldering kit. Soldering requires a certain amount of patience. With success, your welding skills will definitely improve. Working voltage: 9-15V Circuit board size: 4.5CM x 17.5CM Kit Weight: 69g Component name Quantity PCB board 1 5MM LED white hair blue 11 5MM LED white and red 11 5MM LED white hair green 11 9012 triode 3 9013 triode 38 1N4148 Diode 33 1N4007 Diode 1 560 ohm resistor 33 2K-2.2K Resistor 8 4.7K Resistor 14 10K Resistor 12 33K Resistor 8 47K resistor 12 220K Resistor 1 100K Resistor 3 50K blue and white potentiometer 4 4.7UF capacitor 10 220UF25V capacitor 2 104 ceramic capacitor 5 103 ceramic capacitor 2 102 ceramic capacitor 1 222 ceramic capacitor 1 LM7806 1 XH2.54-2P elbow 1 XH2.54-2P line 1 with foot microphone 1 Colour: black Material: PCB Package Contents: 1 x Electronic kit Only the above package content, other products are not included. Note: Light 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.