Wristwatch and method applicable to wristwatch for controlling magnitude of short distance communication signals

A wristwatch comprising a housing, a bottom cover, and a top cover, the housing made of a metal material, the top cover made of a non-metal material, the wristwatch further comprising:

• a short distance communication module disposed inside the housing, configured to carry out short distance communication with an external device, the short distance communication module comprising:
• a security chip configured to process private information of a user;
• and
• a coil configured to transmit electromagnetic signals, the wristwatch further comprising:
• at least a magnetic isolation layer disposed inside the housing and surrounding an inner face of the housing, the magnetic isolation layer having at least a notch that is deployed along a specific direction with respect to the housing.

A method applicable to a wristwatch for controlling magnitude of short distance communication signals, the wristwatch comprising a housing, a bottom cover, and a top cover, the method comprising:

• disposing a security chip and a coil inside the housing and using the security chip to interpret electromagnetic signals transmitted by the coil to carry out short distance communication with an external device;
• providing a plurality of combinations in deploying a magnetic isolation layer, in which the combinations are different in a number, a shape, and/or arrangement of parts of the magnetic isolation layer;
• disposing the magnetic isolation layer inside the housing and surrounding an inner face of the housing for each type of the combinations, and measuring corresponding intensity distribution of the short distance communication signals;
• and
• determining an elected intensity distribution from all of the measured intensity distribution and a combination of the magnetic isolation layer corresponding to the elected intensity distribution.