A device comprising: a substrate; a first coating deposited on the substrate; an intermediate coating deposited on the first coating, wherein the first coating is interposed between the substrate and the intermediate coating; and a second coating deposited on the intermediate coating, wherein the intermediate coating is interposed between the first coating and the second coating, and the second coating is outermost and black. The substrate, the first coating, the intermediate coating and the second coating define at least one of a jewelry item and a component of a jewelry item.

A watch band is disclosed. The watch band maintains a substantially constant tension throughout changes in its length while worn by a user. Such changes in length may occur automatically to accommodate changes in the size and circumference of a user's wrist as they move their wrist normally. By maintaining a constant tension, the watch band also maintains a constant force on the user's wrist, and causes a watch body attached to the watch band to also maintain a constant force on the user's wrist. This can increase a user's comfort, since the watch will not get tighter or constrict their wrist as they straighten and bend their wrist. It can also help optimize operation of any sensors in the watch band or watch body that benefit from being held against the user's wrist with a constant force, such as some physiological sensors.

A watch can include a watch band having a first strap segment, a second strap segment, a nest portion secured between the first strap segment and the second strap segment, and an opening extending through the nest portion. The watch can further include a housing releasably mountable to the nest portion, and a sensor disposed within the housing and configured to align with the opening when the housing is mounted to the nest portion.

A wearable contact tracing wristband has a main body with a QR code, at least one indicator light, a location tracker, and a processor. The indicator light provides a visual indication, such as a red light, of when the user is exposed to the condition and until testing or clearance occurs. A wireless communication module is connected to the processor, for remote and automatic activation of the indicator light.

A wearable detection device includes a main body, a first belt body, and a second belt body. The first belt body and the second belt body are connected to two sides of the main body. The main body includes a power source, a control circuit connected to the power source, and a processor connected to the control circuit. The wearable detection device further includes a flexible circuit board and a plurality of to-be-conducted chips. The flexible circuit board is disposed in the first belt body and is connected to the main body. The plurality of to-be-conducted chips are disposed in the first belt body and are connected to the flexible circuit board. When the first belt body and the second belt body are interconnected, the to-be-conducted chip positioned at a junction point is connected.

Disclosed is a spinnable jewelry item, including: a rotating assembly having a rotating face and a main shaft connected with the rotating face, the rotating face rotating with the main shaft as axis; a positioning assembly having a positioning face, the positioning face elastically abutting against the rotating face along the axial direction of the main shaft; a protrusion and a recess opposite the protrusion being provided on opposite surfaces of the positioning face and the rotating face; when the rotating face is rotated, the protrusion enters or exits the recess; an elastic element applying an elastic force against the positioning assembly, such that the positioning face resiliently abutting against the rotating face; a main body part having an opening structure, wherein the main shaft is rotatably connected with the bottom of the opening structure after passing through the positioning assembly and the elastic element, and the positioning assembly and the elastic element are disposed in the opening structure. the spinnable jewelry item has a structure that can be rotated to be positioned, such that various vies of the jewelry item can be well presented, thereby better satisfying a consumer's demands on versatility.

Disclosed is a spinnable jewelry item, including: a rotating assembly having a rotating face and a main shaft connected with the rotating face, the rotating face rotating with the main shaft as axis; a positioning assembly having a positioning face, the positioning face elastically abutting against the rotating face along the axial direction of the main shaft; a protrusion and a recess opposite the protrusion being provided on opposite surfaces of the positioning face and the rotating face; when the rotating face is rotated, the protrusion enters or exits the recess; an elastic element applying an elastic force against the positioning assembly, such that the positioning face resiliently abutting against the rotating face; a main body part having an opening structure, wherein the main shaft is rotatably connected with the bottom of the opening structure after passing through the positioning assembly and the elastic element, and the positioning assembly and the elastic element are disposed in the opening structure. the spinnable jewelry item has a structure that can be rotated to be positioned, such that various vies of the jewelry item can be well presented, thereby better satisfying a consumer's demands on versatility.

A wearable contact tracing wristband has a main body with a QR code, at least one indicator light, a location tracker, and a processor. The indicator light provides a visual indication, such as a red light, of when the user is exposed to the condition and until testing or clearance occurs. A wireless communication module is connected to the processor, for remote and automatic activation of the indicator light.

Wearable electronic devices, such as smart watches, can be provided with a band for securing the device to a wearer. The device and the band can include near-field communications (NFC) components that allow the device to uniquely identify the band. Device operations such as the color, theme, or content displayed on the device can be based, in part, on the identification of a particular band. The band may include a miniature NFC tag in an attachment portion of the band that is configured to be received in a recess in a housing of the device. An NFC module for reading the NFC tag can be provided within the recess of the housing, so that the attachment portion of the band and the recess in the device housing position and align the NFC tag with the NFC module when the band is attached to the device.

Wearable electronic devices, such as smart watches, can be provided with a band for securing the device to a wearer. The device and the band can include near-field communications (NFC) components that allow the device to uniquely identify the band. Device operations such as the color, theme, or content displayed on the device can be based, in part, on the identification of a particular band. The band may include a miniature NFC tag in an attachment portion of the band that is configured to be received in a recess in a housing of the device. An NFC module for reading the NFC tag can be provided within the recess of the housing, so that the attachment portion of the band and the recess in the device housing position and align the NFC tag with the NFC module when the band is attached to the device.