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Features: Since prism is semi-reflecting, light beam can not goes through it completely, but reached the photo-diode through the lens. Due to the disc surface is uneven point to record data, so the reflected light will be in different directions; people define different direction of signal as "0" or "1", light-emitting diodes gets the data of "0", "1", and ultimately resolve them as the data we need. Specifications: Model: PVR-802W Excitation Mode: Electric excitation Operation Mode: Continuous Wavelength Range: Visible light Length: 4.8cm/1.88in Weight: 20g(approx.) Package Includes: 1 x Head