PZDK series of automatic constant current charge and discharge equipments are specially designed for the battery charging and discharging applied in railway. They are used for the maintenance and capacity verification of storage battery used in locomotive, railway vehicle and generator car, which can improve the service life of the battery and ensure the safe running of locomotives and other railway vehicles.
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According to the annual report, the LED business of Weiwei Co., Ltd. had an operating income of 366 million yuan in 2012, a year-on-year decrease of 32% and a gross profit of 25%.
The annual report pointed out that the main reason for the decline in performance was that the company's main market, the North American market, was affected by the objective weather factors of the previous year, which caused the decline in orders during the reporting period. The fundamental reason was that the company's single product and single market business structure were resistant. The risk ability is weak.
Wei Wei said that in 2013, the company's research and development work focused on low-power photovoltaic lighting technology and medium and high-power LED lighting technology, including ceiling lamp series, candle light series, dimmable series, street light series, home LED intelligent lighting system, etc. LED lighting solutions. 
On April 12, Weiwei Co., Ltd. released its 2012 annual report. During the reporting period, the company achieved operating income of 454 million yuan, down 25% from the same period of last year; net profit attributable to shareholders of listed companies was 5.83 million yuan, down 90% from the same period of the previous year. The basic earnings per share was 0.05 yuan, a year-on-year decrease of 91%.