CASIO BACK TO THE FUTURE CA-500WEBF-1AJR Brand new, unopened. CASIO CLASSIC Back to the Future CA-500WEBF-1AJR Casio Classic Back to the Future Collaboration Calculator Model Silver Watch (CA500WEBF1AJR) To prevent swapping, cancellations and returns are not accepted. BTTF Back to the Future Casio Case size (H x W x D) 43.2 × 34.4 × 8.2 mm Weight 53 g Case / bezel material Resin Band Metal band (stainless steel) Free-type clasp Water resistance Water resistant for daily use Power supply and battery life Battery life: Approximately 5 years