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Low-level laser therapy vs red light therapy: what’s the difference and which one is right for you?
This branch of skincare can feel like a maze of jargon and two terms that are often tossed around are low-level laser therapy (LLLT) and red light therapy. But what are they and how do they differ?
Hackaday14y
Laser Mic Makes Eavesdropping Remarkably Simple
The transmitter is a set of lasers, one is visible red for aiming ... The receiver module has a phototransistor to pick up the infrared laser light, and an LM386 audio amplifier to generate ...