Hi Enrique Aparicio...
Got to the following website and download your manual
Bud
https://docs.google.com/viewer?a=v&q=cache:PLuFdndb0jcJ:www.sigmasport.com/us/allgemein/showdatei/?download%3D1%26name%3D3_1_Manual_BC906_USA.pdf+Sigma+Bc+906+Computer+user+manual&hl=en&gl=ca&pid=bl&srcid=ADGEESjmWFy82205e8C7AUiLD8618PQdH7XiGoaPs7YDAhhfeG3hQorHFs9KtltB03XNQCqV5WSPaAO34MaLHc-wJkIms2qtdE-xgWfzDWT5gnwuRFlrKWPePpzuze_mnsV2GWoT0cqU&sig=AHIEtbQx1n_behQSle5XjQgQuTfiyesg2A
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