Tecnotempo Automatic Chronograph - "TelemetriX" - Swiss Movt - Limited Edition 30OPCS New with box and 2 year official warranty Swiss Automatic Movement Landeron. The case measures 40mm in diameter (excluding crown) and 15,2mm in thickness Stainless steel 316L case Automatic Chronograph (up to 30 minutes) Telemeter Function: The telemeter is used to measure the distance between the observer of a phenomenon (such as lightning) that is first visible and then audible. The measurement is based on the speed of sound (343 m/s). For example, to determine the distance of lightning from the wearer of the watch, start the chronograph when the lightning appears; then stop the chronograph when you hear the thunder and the chronograph second hand will indicate the distance in Km on the telegraph scale. Sapphire glass Screw crown LIMITED EDITION OF 300 PIECES. WARRANTY