Nixon Regulus Developed in conjunction with US Special Forces, the Regulus is hands down the toughest timepiece we’ve ever made. It’s shock-proof, ultra water-resistant, has a five-year battery, and is equipped with features like dual timers, silent mode, adjustable LED backlight, and three independent alarms. Watch Size: 46mm Watch Case Material: TR-90 Watch Case Thickness: 16mm Watch Crystal Material: Hardened Mineral Watch Movement Type: Quartz Digital Water Rating: 100 Meter / 10 ATM Lug Measurement: 24mm Band Material: TPU Band Connection: Screw Bar Band Type: Free Swing