Fake Alarm Lamp Solar energy can be absorbed and saved in high efficiency solar cells,it's powered by solar,no need install battery 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.You can cover the other end by dark paper if you want it to flash in daytime. Car Solar Power LED Light can be charged by solar whether you put switch to "on" or "off" Dummy Car Alarm Flashing Light no wires needed, just stick it to the roof of the vehicle with corresponding glue Car Anti Theft Light Demention: 5*2.5cm (2*1 inches) This vehicle theft deterrent light product can protect your property from potential thieves at night. The bright flashing LED light simulates the lights used in expensive vehicle alarm systems, causes thieves to pass your vehicle in search of an easier target. The light can also discourage break-ins in nighttime. Easy to install and looks clean on your dash panel. The LED light will flash in nighttime and will not flash in daytime.(You can cover the other end by dark paper if you want it to flash in daytime.) This LED alarm does NOT require a car alarm system. No wires needed, just stick it to the roof of the vehicle with corresponding glue. Solar energy can be absorbed and saved in high efficiency solar cells. I have tested by myself that this LED can blink for whole night after enough sun shining in daytime. You need not put it under sunshine directly.Sunshine above the dashboard is enough. It can be charged by solar whether you put switch to "on" or "off". Switch is tiny.You need a ballpen or little stick to push it. Special Function:The item will only blink when it is dark; Will NOT blink when it is light enough (for example:when it is put in the dark indoor during the day it will blink;when it is put in the place with enough light during the night it will not blink) Colour:Black Light color:blue Material:ABS+LED Package Includes: 1x Alarm Light Only the above package content, other products are not included. Note: Light shooting 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.