Scheme for setting/using electronic device as keyless device of vehicle and adjusting devices in the vehicle

A wearable electronic device to be used as a keyless device of a vehicle, wherein the wearable electronic device comprises:

• a detection module to perform an activity detection upon an authorized person which has been authorized by the wearable electronic device;
• wherein the wearable electronic device is performed as a keyless device to open a car door and start the vehicle according to a result of the activity detection after a personal identification is performed by the wearable electronic device;
• the car door of the vehicle is opened or the vehicle is started without requiring a personal identification of a smart phone when both conditions are satisfied wherein the both conditions are that the authorized person, which has been authorized by the wearable electronic device, uses the wearable electronic device performing a physiological feature detection upon the authorized person to reconfirm the authorized person and the authorized person uses the wearable electronic device, which is continuously worn on the person and not taken off, acting as the keyless device:
• the wearable electronic device is configured as the keyless device of the vehicle to earlier activate or unlock a portion of a security system at a specific location in response to an event that the authorized person is driving the vehicle and the vehicle approaches the specific location.