Feature: 1. Alarm principle, when shaking the DIY model, the copper wire of the glass beads will contact the O ‑ shaped lamp, the line is connected, the buzzer issued a sound. 2. Let the children become interested in physics, can quickly detect which areas of security is threatened, so that the security work becomes easier and easier to manage. 3. DIY Infrared alarm model, knowing how does this device work, how does it detect intruders and how does the whole circuit work. 4. The experimental kit develops children's physical and mental skills, improve hands and brain development and improve intelligence development. 5. Powered by 4pcs AA battery, made of high quality wood material, lightweight and convenient to operate. Specification: Item Type: DIY Infrared Alarm Model Material: Wood Battery: 4pcs AA (Not included) Completed Size: Approx. 80 x 65 x 47mm / 3.1 x 2.6 x 1.9inOperating Instructions: 1. Prepare the materials. 2. First on both sides of the wide board stick a strip of double-sided tape, and then stick the short square wood on the double-sided tape, short square wood margin and wide board alignment.(The bonding process is the same for the other group of materials) 3. Fix the long square wood on the wide board with the tie belt, and cut off the end of the tie belt with the scissors after making sure it is firmly fixed 4. (1)First, the self-colored wiring device is tied to the top of the square wood without holes with a tie, and then stick a double-sided tape on the base.(2) Glue the battery box to the base, and then clip the red and black wires into the wiring device respectively (see Step5 for the clamping method) and then tie the wires with a tie. 5. The infrared head card into the wiring device, pay attention to the long pin and red card in the same channel, short pin and black card in the same channel. The use of the wiring device: (1) First of all, press the buckle with your hand (2) Extend the metal wire core to the inner metal sheet (3) Release the buckle, the metal automatically stuck wire core, wiring is completed 6. Insert the photosensitive resistor into the white terminal, and then cut the over-long pins. 7. Installation and connection diagram of electronic components. 8. First loosen the screws on the terminals with a screwdriver, and then insert the pins and thread cores of electronic components into the gaskets below the screws, and then tighten the screws. Note: The pins under the terminal block face the direction of the buzzer. Please do not install them wrong.The triode must have the letters facing up, the three pins of the blue and white adjustable resistor are only connected with pins 2 and 1, the buzzer and the LED need to be separated into "+-" pole, the long pin is connected with "+" pole, and the short pin is connected with "-" pole. 9. Reference drawing of components installation.Note: Blue and white adjustable resistors are only connected to 1 and 2 pins, or 2 and 3 pins, with another pin dangling.Please remove the buzzer sticker after installation. 10. Stick double-sided tape on the bottom of the battery box and the bottom of the terminal 11. First stick the battery box to the base plate, and then insert the white terminal into the round hole on the top of the square wood. 12. Glue the terminal base to the front end of the square wood. 13. Tie up the wire with the tie and cut off the end of the tie with scissors. 14. Please close the gate switch on the battery box when working. The infrared light must be emitted on the photosensitive resistor. You can aim the infrared light at the photosensitive resistor by trimming the wiring device up and down.Note: the end of the alarm should not be placed under strong light. Strong light will cause the alarm induction failure. Note: After the power is turned on, the buzzer is sounded by default, adjustable resistance, the white photodiode of the resistance will also light up, and the light needs to be directed at the photosensitive resistance.If the buzzer does not ring after the light is aligned and the power is turned on, please check whether the components are installed correctly.. Package List: 8 x Wood Board 2 x Battery Box 1 x Double-Sided Adhesive 6 x Cable Tie 1 x Connection Cable 8 x Accessory