The present invention provides a rotary adjustable watch band comprising a rectangular housing with a rotary gear extending therethrough, a tab extends upwardly from the housing, a fastener extending down from the housing and the fastener being in communication with the rotary gear whereby rotation of the rotary gear incrementally spaces the fastener from the housing.

A clasp for a jewelry system has two arms and a sleeve that can slide to a position covering at least portions of both arms. In this position, the sleeve urges the clasp from an un-locked state towards a locked state.

A clasp for a jewelry system has two arms and a sleeve that can slide to a position covering at least portions of both arms. In this position, the sleeve urges the clasp from an un-locked state towards a locked state.

A band includes, a long band member; a second member provided at one end side of the band member; and a first member including a through hole through which the second member and at least one end side of the band member in which the second member is provided are inserted. The second member or the at least one end side of the band member maintains a first state with a width or a thickness that is larger than a width or a thickness of the through hole of the first member in a state in which the second member and the at least one end side of the band member are inserted into the through hole of the first member.

According to an example aspect of the present invention, there is provided a strap for a wearable device having a terminal device. A fixed buckle is provided to one end of the body of the strap to receive the strap body through the fixed buckle in a looped configuration of the strap. A slide buckle is provided movably to the strap body and has an open keeper hook for removably receiving an excess portion of the strap body through the keeper hook. The strap has a first keeper counterpart provided on the strap body, and a second keeper counterpart provided to a second end of the strap body for attachment to the first keeper counterpart.

According to an example aspect of the present invention, there is provided a strap for a wearable device having a terminal device. A fixed buckle is provided to one end of the body of the strap to receive the strap body through the fixed buckle in a looped configuration of the strap. A slide buckle is provided movably to the strap body and has an open keeper hook for removably receiving an excess portion of the strap body through the keeper hook. The strap has a first keeper counterpart provided on the strap body, and a second keeper counterpart provided to a second end of the strap body for attachment to the first keeper counterpart.