Measuring the decay of time using Carnots second law of thermo dynamics. With quartz movement. One size adjustable.
How to change watch batteries and set time
• Carefully pry the watch face movement from the case
• Then pry backing from watch face to replace the battery
• While watch face is off, you can adjust the dial to set time
• Replace backing and watch face
• Lastly, Ensure battery is inserted with the corrected side down