Watermelon skin is an APP for smart watches. When making a phone call, the smart watch can only dial by adding a phone number to this software. There is a button on the watch to enter the phone book. Try it yourself. Click to scroll up and down after entering the phone book, and press and hold to make a call. Otherwise, you can't call.

A watch refers to a tool worn on your wrist to time/display time.

Watches are usually made of leather, rubber, nylon cloth, stainless steel and other materials, and the "meter" showing time is tied on the wrist.

The manufacture and production of watches are based on a simple and witty invention, that is, "clockwork". It can tighten and store energy, and it can slowly release energy to push the running device and hands in the watch to display time. This spring device in the watch is called the main spring. Watch structure A watch consists of a meter head and a strap (clasp). Among them, the parts of the rice head include: movement, case, bottom cover, mirror, characters (often called dial), hands, handles (also called push) and order (required by some tables).

The working principle of watches, watches are precision instruments used to display time. The principle of this instrument is to use a vibration system with constant period and continuous vibration as the standard. If we know the time (vibration period) required for a vibration system to complete a complete watch vibration and calculate the vibration times, then the time after so many vibrations is equal to the vibration period multiplied by the vibration times. That is, time = vibration period × vibration times.

The mechanical watch with balance shaft hairspring adopts balance spring as vibration system. The balance wheel 1 is fixed on the balance shaft 2, and the upper and lower journals of the balance shaft are sleeved in the bearing and can rotate around the bearing. One end of the hairspring part 3 is fixed on the swing shaft, and the other end is fixed on the splint. Due to the elastic deformation of the hairspring, the motion of the balance wheel changes from rotation to reciprocating motion. The balance hairspring system is affected by bearing friction, air resistance and internal friction of hairspring, and the swing amplitude (amplitude) will gradually decay until it stops. In order to make it vibrate continuously without attenuation, it is necessary to replenish energy to the hairspring system regularly, that is to say, there must be an energy device in the watch. The periodic energy supplement of vibration system is realized by a special mechanism & escapement mechanism. The escapement mechanism is also used to calculate the vibration time of the hairspring system. Therefore, the hairspring system and escapement mechanism are the key devices of mechanical watches.