Abstract: In a voice signal relay and transfer method for a voice call between a radio voice terminal and a remote device includes, a radio voice signal is received from the radio voice terminal and converting the radio voice signal into a digital voice signal. The digital voice signal is further converted into a group of voice packets in a streaming form. Then the group of voice packets is transmitted to a streaming server via a mobile communication network. The group of voice packets is further transferred from the streaming server to the remote device in a streaming form.

Abstract: A walker with a foldable mechanism comprising an actuator which has an operating lever and an actuating groove. The actuator is rotated when a user laterally moves the operating lever, whereby an actuating groove pushes a positioning rod upward so as to release a fixed frame from a locked position into a folded state, thereby improving the safety of the user while the walker is use.

Abstract: A locking mechanism for use with a walker having a frame including a pair of fixed tubes, each lower end of the fixed tube being connected to a securer. A securing piece extends from the securer and is embraced by a rotating ring which can be rotated along with a handle bar. Upon rotating the handle bar for operation, the securing piece is compressed by the rotating ring and further secures a supporting leg with its resilience so as to reduce shaking of the supporting leg. Therefore, better stability of the walker is achieved.