Abstract: A health care device and a health care method are illustrated, the health care method is used to arrange the health care device at a predetermined location in front of a belly button of a user with a predetermined distance, and to emit the low-frequency wave with a predetermined frequency to the belly button by using a low-frequency wave emitter. The health care device is formed by the low-frequency wave emitter and a cone/pyramid part. The predetermined frequency is 1.27 Hz to 1.81 Hz, and the predetermined distance is 5 cm to 8 cm. The above health care device and method can increase contents of active T cells and B cells in blood and increase an ability of NK cell strains for poisoning cancer cell strains (K562). In short, the above health care device and method have health benefits without a risk of excessive energy causing harm.

Abstract: A tie clip is constructed to include a shell, and a clip for securing the shell to a loose knot in a necktie, the shell having a flat body and two symmetrical wings turned backwards and then inwards toward each other from two opposite sides of the body, the wings being spaced from each other by a gap and defining with the body a receiving space having a narrow bottom mouth for receiving the knot of the necktie, the clip including a base frame fixedly fastened to the body of the shell inside the receiving space, the base frame having an upper clamping arm and two lower clamping arms, and a hook coupled to the upper clamping arm and the two lower clamping arms of the mounting frame and turned between a first position where the shell is allowed to be attached to the knot of the necktie, and a second position where the hook is hooked on the knot of the necktie to secure the shell to the necktie.