A timing device for indicating the passage of a duration of time is disclosed. The timing device and system, in accordance with the embodiments of the invention, comprise an electrochemical component which generates a visual and/or audio indication of the passage of time. The timing device further comprises a compensating element, such as a varistor, a thermistor and/or combinations thereof. The compensating element regulates the response of the device with respect to changes in temperature. The timing device is configured to indicate the passage of a single duration of time or comprises zones that are activated in a range of prescribed times and individually or collectively indicate the passage of time or the passage of a range of times.

A smart wristband with a rotatable dial has a dial, a case and a band. The case is embedded in the band. The dial is rotatably disposed in the case. An end of the dial is provided with a USB port, and the USB port is hidden between the dial and the case. The dial has a bottom case, a rotating ring is fixed at a bottom of the bottom case, the case is sandwiched between the bottom case and the rotating ring, and relative rotation between the dial and the case is achieved by the cooperation and relative rotation between the rotating ring and the case. An opening is provided at an end of the bottom case, a protruding buckling rib is provided at the other end, and a buckling groove that matches the protruding buckling rib is formed at the corresponding position of the case.

A timing device for indicating the passage of a duration of time is disclosed. The timing device and system, in accordance with the embodiments of the invention, comprise an electrochemical component which generates a visual and/or audio indication of the passage of time. The timing device further comprises a compensating element, such as a varistor, a thermistor and/or combinations thereof. The compensating element regulates the response of the device with respect to changes in temperature. The timing device is configured to indicate the passage of a single duration of time or comprises zones that are activated in a range of prescribed times and individually or collectively indicate the passage of time or the passage of a range of times.

A smart wristband with a rotatable dial comprises a dial, a case and a band. The case is embedded in the band. The dial is rotatably disposed in the case. An end of the dial is provided with a USB port, and the USB port is hidden between the dial and the case. The dial comprises a bottom case, a rotating ring is fixed at a bottom of the bottom case, the case is sandwiched between the bottom case and the rotating ring, and relative rotation between the dial and the case is achieved by the cooperation and relative rotation between the rotating ring and the case.

A timing device for indicating the passage of a duration of time is disclosed. The timing device and system, in accordance with the embodiments of the invention, comprise an electrochemical component which generates a visual and/or audio indication of the passage of time. The timing device further comprises a compensating element, such as a varistor, a thermistor and/or combinations thereof. The compensating element regulates the response of the device with respect to changes in temperature. The timing device is configured to indicate the passage of a single duration of time or comprises zones that are activated in a range of prescribed times and individually or collectively indicate the passage of time or the passage of a range of times.

A timing device for indicating the passage of a duration of time is disclosed. The timing device and system, in accordance with the embodiments of the invention, comprise an electrochemical component which generates a visual and/or audio indication of the passage of time. The timing device further comprises a compensating element, such as a varistor, a thermistor and/or combinations thereof. The compensating element regulates the response of the device with respect to changes in temperature. The timing device is configured to indicate the passage of a single duration of time or comprises zones that are activated in a range of prescribed times and individually or collectively indicate the passage of time or the passage of a range of times.