What is B1 Battle Droid?

A star wars droid used during the clone wars by the CIS. The respond with "ROGER ROGER" instead of yes. To any CIS fan this is the only way to respond instead of yes. They are pretty weak but the CIS believes in Joseph Stalin's "quantity has a quality on its own" phrase and get huge numbers of b1 battle droids. Many clones call them "clankers".