আমরা রোবট বানাই এবং ইলেকট্রনিক্স যন্ত্রপাতি বিক্রয় করে থাকি। 

LED (5mm) – 5 pieces A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) is determined by the energy required [...]