The DGT XL, introduced in 2003, is in full accordance with FIDE rules & regulations. It is the clock you will see most frequently in photo reports of top level tournaments, as it is the only clock that connects to the DGT electronic chess board, used for live internet broadcasting of chess games. It has all the advantages of the DGT 2010, the other DGT clock approved by the world chess federation & several extra options & features, which make the DGT XL the ultimate in chess clock technology. Requires 2 AA Batteries (not included).