Hamilton H24525331 Ventura Elvis80 Skeleton Auto 42mm x 45mmDare to be bold with the Ventura Elvis80 Skeleton, an ultra-modern tribute to the past, present and future of the world’s first electric watch. A powerful evolution of a revolutionary timepiece, its precise skeletonized dial features a striking zigzag at the center to match its luminous rose gold PVD-coated, triangular case. This bolt of energy celebrates an iconic symbol of innovation and draws the eye to the automatic H-10-S movement underneath.SELF-WINDINGWrist movements cause the inner rotor to swing, transferring energy to the mainspring, and powering your timepiece.STAINLESS STEEL CASEA highly resistant alloy composed of steel and chromium. It can be worked to resemble a precious metal. It is nearly impervious to rust, tarnish, and corrosion.SAPPHIRE CRYSTALSynthetic sapphire crystal is a tough scratch-resistant material, only diamonds could leave a mark.NIVACHRON™ BALANCE SPRINGNivachron™ is an alloy used to produce balance spring to resist magnetic fields and improve accuracy. It reduces the effects of magnets, temperature, and shocks.H-10-S CALIBERA three-hand automatic skeleton movement boasting a superior power reserve of 80 hours and featuring a Nivachron™ balance spring.WATER RESISTANCEYour timepiece is resistant up to 5 bar (50m) / 73 psi (164 ft).