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. REASONS TO BUY: 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. Reliable quality: the infrared alarm is made of high-quality abs material, which is and has a long service life. 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. BUYER SAYS: I tried and it really works! value for money. Method of use 3 button batteries (LR44); Pull the alarm lever to trigger the alarm; Press 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 within three meters of the area to be monitored. (2) move the "slide" down. (3) slide the "off /auto" switch to auto, and the product enter the alert state. After 35 seconds, if the movement is detected in the covered area, the alarm sound for 15 seconds, and then automatically reset to enter thealert state again. Colour:As Shown Material:plastic Package Contents: 1 x Infrared Motion Sensor On