1.service life of the solar panel:15 years                                                       

 2.battery life:two years above                                                                          

 3.LED(yellow):service life 100,000 hours                                                      

 4.controlled by wireless intelligent transmitting station,the chevron alignment sign has wireless synchronous stroboscopic effect within 2,000 meters.                               

 5.the transmitting station can be opened automatically with certain illuminance and the chevron alignment sign LED then goes out.                                                       

 6.continuously operation for forty successive rainy days.