Options： with base: include bluetooth module +speaker+ roating base+ shell Contact customer service sent detailed welding procedure documents via email  SpecificationPower supply: DC5V Working current: <500mA Operating temperature: 0~40℃ Power supply type: DC5V 1A Purpose: decoration, play music,gift,welding practic Accessories: power cord Feature： 1. Colorful Music Making Christmas Tree DIY KitFeatures1.principle of Christmas tree kit: 5v USB power input, power on by switch S1, the SCM will drive 40 LEDs on or off according to a certain rule, forming different animation effects. The chip microcomputer reads the audio file of the memory card and outputs it to the loudspeaker ,It can also read the music information inside the MCU to output music.the remote controller can control the music playing and LED display. 2.Function:LED display is 7 color LED, when power on, LED will automatically change various colors. 36 LEDs are distributed on the leaves of the Christmas tree. 3.Suitable for electronic DIY electronic hobby beginners to learn and practice welding.It is widely used in schools to help students learn basic mechanical and electronic skills.