Diy Laser Alarm Kit Security System

These are component of the kit and needs to be assembled by yourself. Note : This product doesn't include the battery. Please understand. Working Principle: When no light to the photosensitive resistor, the troide is turned on, the buzzer gets the power to start warning. When the light is exposed to the photosensitive resistor, the triode is blocked, the buzzer is powered off and stops warning. Here the triode is used as an electronic switch.And the sensitivity can be adjusted by the potentiometer. Laser Module: 5mW Operating Voltage: 3V Precautions for using:  1. Laser is harmful to the eyes. Please do not expose it directly to the eyes, and do not look at the laser head. Remember! (If you need to protect your eyes, you can also wear laser protective goggles) 2. This laser is a low-power laser, and is considered a safe laser. 3. The laser cannot use on any reflective or smooth surface. The laser has excellent reflectivity, and when it used on the reflective surface, it will produce reflection. If it happens to hit the eyes of a person, it can cause injury. 3. Children need to use it under adult supervision. 4. You need to remove the battery when not in use.

Returns Accepted for this item if it's within 14 Days