Synchronous Central Adjustment Digital Stopwatch Case Dimension: 12 x 30 cm. Number Height: 57 mm. Once the designated central Chronometer is set, all chronometers are set. All Chronometers work synchronously. It can be set up to 99 minutes. Minutes and seconds can be adjusted separately. It is adjusted by remote control. It is hung with a hanging device. The cable can be prepared in the desired length. It is used indoors. It is 4 digits. Our products are our own production and are guaranteed against manufacturing defects for 2 years.