electric generator, but was discontinued following complaints that the device could explode and cause wrist injuries. There was also an Eco-Drive Thermo model that exploited temperature differentials between the wearer's skin temperature and ambient temperature to recharge the battery. However, the only Eco-Drive system described on the Citizen Watch official website is the one depending solely on light to recharge. Features similar to the Eco-Drive have been developed by other manufacturers like Casio and Junghans. All Citizen Eco-Drive movements are made in Japan but the case or the bracelet may also be made in China. Noblia In 1985 the Zen Noblia Ultra Slim watch was introduced as a model by Citizen. From 1986 to 1997 Citizen offered watches under the Noblia brand. These were in the high-priced segment and combined a traditional-classical design with modern quartz movements. Noblia was an outfitter and sponsor of the Louis Vuitton Cup and the Star North American Championship. Noblia was discontinued in 1997 after releasing a collection of ceramic clocks. Q&Q SmileSolar Q&Q SmileSolar is a line of solar powered watches, which do not require a battery change. They are made of recycled materials and have a water resistant rating of 10 Bar. The line of watches also supports people by making a donation for each watch purchased. Other products Citizen also manufactures calculators and small electronic organizers. Some non-watch devices such as handheld televisions and computer printers, have been marketed under the Citizen brand name. In the 1980s, a number of handheld electronic games were sold under the Q&Q brand. In the early-mid 1990s, Citizen partnered with Compaq Computer Corporation to build notebook computers in Japan for the Japan and Far Eastern market to be sold under the Compaq name. On January 10, 2008, Citizen bought the Bulova Watch Company for $250 million, making The Citizen Group the world's largest watchmaker. In 2016, Citizen acquired the Swiss Frédérique Constant Group. Corporate divisions Japan CBM Corporation – Sales of timepieces, including the Q&Q brand. Citizen Systems Japan Co., Ltd. – Sales of business and consumer electronic devices including calculators. Citizen Miyota Co., Ltd. – Production of wristwatches, quartz crystal oscillators, electronic viewfinders, LCD back-light units, CCD/CMOS image sensors, ferroelectric micro LCDs, LCoS, high-density mounting equipment. Citizen Fine Tech Co., Ltd. – Manufacturing and sales of electronic components (ceramic parts, quartz crystal oscillator chips, etc.). Citizen Seimitsu Co., Ltd. – Manufacturing of watch movements, watch