Devices, systems, and methods are disclosed herein for remotely determining blood pressure in a mammalian subject. At least two tines on each tine member differ in shape from the remaining tines. A split drive ring is rotatably clampable about the split collar and supported by the drive ring support. The loading step loads backup information from the source optical disc when the target optical disc is qualified as the backup disc. The guide block is pivoted to the second end of the adjusting lever. According to the method and device of the invention, the user can quickly and visually search a TV channel independent on EPG information after the correspondence relationship of images and frequencies has been established by snatching screenshots of real time TV pictures, and the method and device is applicable in both analog TV and digital TV.