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Diode laser emits 635-nm light and is ideal for conducting laser and optical experiments including voice and audio optical transmissions. Features externally adjustable internal electronic amplifier suitable for low-voltage microphone inputs and higher amplitude AM/FM radio signals, analog and digital modulation capabilities, fool-proof beam stop, impact-resistant case, tamper-resistant screws, tripod mount, skid-proof rubber feet, full-color manual, and 4-year manufacturer's warranty.