<ul><li>The sensor uses a non-modulated laser receiver.</li><li>Please use this sensor in dark environments or indoors where no light. Sunlight or other fixtures may interfere.</li><li>It output high level when receive laser signal, and low level when not.</li><li>If you buy 1, you will receive 5pcs sensor</li><li>If you have any issue when using our product,or you need product use documentation please contact us directly for assistance.we will solve your problem in 24 hours.</li></ul><br><br>

Geekstory 5V Laser Receiver Sensor Detection Module Non-Modulator Tube for Arduino Geekstory(Pack of 5)