Helllo every one sonata brand is perdfect but some models are worst like a sonata 77027 pp1j is third class performance because I percheched befor 7 month ago and this watch model are botn type analoge and digital also analoge are contine working performance are very bad and this model battry ( cell) performance are very poor one biggest and important issue is sanata say in this model have silicon balt but this no available at belt issue is major this class belt performance.