Features: It has a built-in vibration sensor, which can capture any vibration at any for time and emit a strong flash. It is an for ideal choice for security and anti-theft alarms for cars, motorcycles, caravans, boats, trucks, houses, sheds, etc. Can also be used for fenced gates. Easy to install, no wires, easy to stick tape, just stick it to the roof of the car with the corresponding glue, and it can be flexibly installed where the thief can'for t see it. It is powered by solar energy, which can be absorbed and stored by high-efficiency solar cells. When there is enough sunlight during the day, its energy storage can flash all night. Dummy car alarm will only flash when it is dark; will not flash when it is light enough to keep item have highly efficient and longer life. Specifications: Material:Plastic Size : Approx.5.2x1.3cm/2.04x0.51inch Light color: white for shell anti-theft light red light Light color: white for shell anti-theft light blue light Light color: black for shell anti-theft light red light Light color: black for shell anti-theft light blue light Package Includes: 1x Alarm LED Light note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.