B612 Movement Eco-Drive Signal Reception Without Radio Reception Function Water Resistant Water Resistant to 20 bar Thickness 13.8mm Case Size 44.5mm Case Stainless Steel Surface Processing IP Black Warranty 3 years Specification 1,000pcs 100th Anniversary Model Worldwide Limited 3 24hrs and Date Display Chronograph Eco-Drive (recharged by any light source, no need to change battery) Insufficient Charge Warning Function Overcharge Prevention Function