... maintenance-free batteries, suitable for convenient external power supply for parking area;3, product main parametersWork environment - 35 degrees - ... 6 second dimension 640 * 160 * 904, installation instructionsIn 1, no parking lock installation in hollows or water for a long time ... the use of informationIn 1, after installation, you can put into normal use;In 2, when the parking car free, controller ...