The invention provides, in some embodiments, watch straps and watches that preserve the aesthetic features of a Nato or military-style watch strap while avoiding the drawbacks associated with the Nato watch strap. The watch straps and watches provide the aesthetic feature of a Nato watch strap without having extra layers of the watch strap between the watch case and the wrist of the wearer.

The invention provides, in some embodiments, watch straps and watches that preserve the aesthetic features of a Nato or military-style watch strap while avoiding the drawbacks associated with the Nato watch strap. The watch straps and watches provide the aesthetic feature of a Nato watch strap without having extra layers of the watch strap between the watch case and the wrist of the wearer.

A wearing member includes: a strap part including a first portion and a second portion extending from the first portion, and a fastening part slidable along the first portion. The first portion extends from one end thereof and passes through the fastening part, and the other end of the first portion is connected to the second portion. The second portion includes one end extending from the first portion, and the other end coupled with the fastening part. The fastening part includes a cover including a magnet, and a fastening part lower member. In a first state, the magnet is spaced apart from the first portion, and the fastening part is slidable from the first portion. In a second state, the first portion is in contact with the magnet, and the fastening part is fixed to the first portion.

A jewelry piece comprising a first flexible elongated member having first and second ends; a second flexible elongated member having first and second ends; a third flexible elongated member having first and second ends; a first clasp removably attaching the second end of the first flexible elongated member to the first end of the second flexible elongated member; a second clasp removably attaching the second end of the second flexible elongated member to the first end of the third flexible elongated member; and a slider slidably coupling the first flexible elongated member to the third flexible elongated member.

An electronic device includes a device body having a back surface, a band configured to fasten the device body to a user with the back surface facing a body part of the user, an optical sensor system, and a device removal detector. The optical sensor system has a first optical measurement path and a second optical measurement path. The first optical measurement path has a first optical path length that differs from a second optical path length of the second optical measurement path. The device removal detector is configured to generate a device removal indication responsive to either of, a first set of object proximity measurements received from the optical sensor system for the first optical measurement path, or a second set of object proximity measurements received from the optical sensor system for the second optical measurement path.

An electronic device includes a device body having a back surface, a band configured to fasten the device body to a user with the back surface facing a body part of the user, an optical sensor system, and a device removal detector. The optical sensor system has a first optical measurement path and a second optical measurement path. The first optical measurement path has a first optical path length that differs from a second optical path length of the second optical measurement path. The device removal detector is configured to generate a device removal indication responsive to either of, a first set of object proximity measurements received from the optical sensor system for the first optical measurement path, or a second set of object proximity measurements received from the optical sensor system for the second optical measurement path.

Embodiments of a watch can include a watch having an analog watch face, a first watch band portion, a second watch band portion and an analog watch face. The watch can include a butterfly clasp having a digital display and a circuit board associated with a controller.

Embodiments of a watch can include a watch having an analog watch face, a first watch band portion, a second watch band portion and an analog watch face. The watch can include a butterfly clasp having a digital display and a circuit board associated with a controller.

Embodiments of a watch can include a watch having an analog watch face, a first watch band portion, a second watch band portion and an analog watch face. The watch can include a butterfly clasp having a digital display and a circuit board associated with a controller.

Embodiments of a watch can include a watch having an analog watch face, a first watch band portion, a second watch band portion and an analog watch face. The watch can include a butterfly clasp having a digital display and a circuit board associated with a controller.