The tactical watch includes a dorsal case, a volar case, a plurality of buttons, one or more sensors, and a band. The tactical watch may be a multi-purpose time-keeping device adapted to be worn on a wrist. The band may encircle the wrist with the dorsal case positioned on a dorsal side of the wrist and the volar case positioned on a volar side of the wrist. An outward facing display on the dorsal case and an inward facing display on the volar case may display the time, biometric data, and other information. The plurality of buttons may be adapted for a user to press in order to control features of the tactical watch.

The present invention provides a one-hand operation system for a watch, comprising a smart watch, a multi-axis sensor, an optical sensor, and a processing unit. The smart watch includes an operation unit that displays a time screen and a menu screen. The watch body has a light-transmitting section on one side. The multi-axis sensor is positioned inside the watch body to detect vibration waves generated by pinching and releasing finger movements. The optical sensor, also located inside the watch body and aligned with the light-transmitting section, detects changes in light during finger pinching, releasing, and arm movements. The processing unit is electrically connected to both sensors to receive their signals, process vibration wave and light intensity data, and recognize gestures such as pinching, releasing, or moving the arm. Based on this, the system can unlock, lock, or activate functions via a click.