Motion detection alarm: This infrared alarm is designed with motion detection function, which can automatically detect the movement of the person. Convenient and portable: The infrared motion sensor detector is small and , easy to carry, and can be placed in a pocket or backpack. Reliable quality: The infrared alarm is made of high-quality abs material, which is and has a long service life. Wireless infrared motion detector: with wireless infrared motion sensor, you can easily identify the location of your home and office. it also has a remote control function to detect small objects such as cars, boats, motorcycles, etc. Method of use: 3 button batteries(LR44); Pull the alarm lever to trigger the alarm; the return lever to stop the alarm; The cover of this product slides downward, and there are "OFF" and "AUTO" keys on the right side. AUTO stands for start of infrared alarm system; OFF means the infrared alarm function is OFF. (1) place the product on a vibration-free, dry, flat