3X Camping Travel Portable Mini PIR Infrared Motion Sensor Detector Alarm 120DB Wireless Home Security Anti-Theft

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; 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 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 the alert state again.
Colour:As Shown
Material:plastic

Package Contents:
3 x Infrared Motion Sensor

Only the above package content, other products are not included.
Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.