Calculator watch Calculator watch A calculator watch is a digital watch with a built in calculator, usually including buttons on the watch face. Calculator watches were first introduced in the 1970s and continue to be produced, despite falling from their peak popularity during the 1980s. The most notable brand is the Casio Databank series, though watches made by Timex were also popular. Most calculator watches contain only a few number of functions such as +, -, x, / and percents. However, there are several models with additional functions: scientific, including transcendent and trigonometry, in models Casio CFX-200, CFX-400, Citizen 49-9421, and also
Sony Xperia Z1 Compact occurred during upgrading but after changing battery Android 5.0 and 5.1.1 are running any issues. Sony Xperia Z1 Compact The Sony Xperia Z1 Compact is an Android smartphone produced by Sony. The Z1 Compact has a 4.3 inch display and is released as a cheaper and smaller version of the flagship Xperia Z1 which features a 5-inch display. The Z1 Compact is the Sony smartphone to use an IPS panel, which improves markedly upon the poor viewing angles of the Xperia Z1 and its flagship predecessors like the Xperia Z and Xperia ZL. The Japanese version of the Z1 Compact,