该倒计时交通灯由三种颜色（红、绿、黄）的LED灯组成，放置于东西与南北方向路口。该交通灯设计了对电池的充放电保护电路，当电池放电小于10.6V时，关闭所有灯。当电池充电大于14.48V时，关闭充电，从而有效的保护了电池并且增加了该产品的使用寿命。该系统默认东西方向为主干道（放行30s），南北方向为次干道（放行20s）。-The countdown traffic lights by the three colors (red, green, yellow) is composed of LED lights placed in the north-south direction of things and junctions. The design of traffic lights on the battery charge and discharge protection circuit, when the battery discharge is less than 10.6V, close all the lights. When the battery charge is greater than 14.48V, turn off the charge, which effectively protects the battery and increases the life of the product. The system default for the main road east-west direction (release 30s), secondary roads north-south direction (release 20s).