This is Casio G-Shock GBA-400 G'mix bought it for 145$, have been using it for 5 years and it has gone through different tortures but still looks brand new. : r/PrideAndPinion
Casio G-SHOCK Updates iPhone Compatible G'Mix Series
Casio G-shock G'MIX GBA-400-2C light blue (5413)with tag GBA400 for sale online | eBay