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 wearable electronic device is provided. The wearable electronic device includes a main body and a wearing unit that allows the main body to be worn on a user's body. The wearing unit may include a first wearing member extending from the main body, a binding member coupled to the first wearing member to be moved in a longitudinal direction of the first wearing member, and a driving member installed in the first wearing member to move the binding member.

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 modular accessory apparatus includes a body component and a housing component. The body component has a first end and a second end, wherein the body component has a curvature such that a cap forms between the first end and the second end along the direction of extension of the curvature, and the first end has a connector. The housing component modularly couples to the connector. The housing component has a housing body, a coupler component, and a gateway block. The housing body has an opening, and the coupler component is disposed in the housing body. The gateway block is disposed in the opening, wherein the gateway block has a through-hole corresponding to the coupler component. The coupler component receives the connector via the through-hole, and the through-hole of the gateway block limits the displacement movement of the connector along a coplanar direction to the direction through the through-hole.

A reel assembly operable to be wound by a screen assembly is provided. The reel assembly is received in a frame assembly, and includes a reel, a connector, a limit part, and a spring. The connector is fixedly connected to the frame assembly. The limit part is rotatably connected to the frame assembly. The reel has one end rotatably connected to the connector, and another opposite end fixedly connected to the limit part. The spring has two opposite ends fixedly connected to the connector and the limit part, respectively. A display device and a smart bracelet are further provided.

A jewelry item is provided to include a ring-shaped spring and a ring-shaped chain. The ring-shaped chain has a plurality of chain links, each of which is slidably attached to the ring-shaped spring. Each chain link has a plate with a first surface facing the spring and a second surface opposite to the first surface. Each chain link further has a seat and a hook opposite to each other. The hook is inserted into a seat of a subsequent chain link so as to lock the chain links to each other while allowing the chain links to reversibly slide from a compressed position to an expanded position with respect to each other.

A jewelry item is provided to include a ring-shaped spring and a ring-shaped chain. The ring-shaped chain has a plurality of chain links, each of which is slidably attached to the ring-shaped spring. Each chain link has a plate with a first surface facing the spring and a second surface opposite to the first surface. Each chain link further has a seat and a hook opposite to each other. The hook is inserted into a seat of a subsequent chain link so as to lock the chain links to each other while allowing the chain links to reversibly slide from a compressed position to an expanded position with respect to each other.

A bracelet and a method of assembling or manufacturing the same in which the bracelet includes a plurality of interlocking first and second bangles that are translatable relative one another such that the bracelet is transitionable between a first state and second state in which the bracelet has a diameter having a smaller dimension in the first state and a larger diameter in the second state, the bracelet being biased toward the first state.

A smart watch includes: a watch dial, a watch band, a monitoring apparatus, and a mechanical transmission apparatus; herein, sensors are set on both front and back surfaces of the watch dial; the watch band is made of hard material and has a multi-section structure; and beginning from a first section of watch band fixedly connected to the watch dial, each section of watch band is a hollow cavity structure that accommodates a next section of watch band; the monitoring apparatus is deployed within the watch dial; the mechanical transmission apparatus is set between the watch dial and the watch band, and is arranged to control extension or retraction of other sections of watch bands for automatically wearing or removal of the watch band. A smart watch automatic wearing method is further provided.

A smart watch includes: a watch dial, a watch band, a monitoring apparatus, and a mechanical transmission apparatus; herein, sensors are set on both front and back surfaces of the watch dial; the watch band is made of hard material and has a multi-section structure; and beginning from a first section of watch band fixedly connected to the watch dial, each section of watch band is a hollow cavity structure that accommodates a next section of watch band; the monitoring apparatus is deployed within the watch dial; the mechanical transmission apparatus is set between the watch dial and the watch band, and is arranged to control extension or retraction of other sections of watch bands for automatically wearing or removal of the watch band. A smart watch automatic wearing method is further provided.