Abstract: Two flexible waterproof plastic strips sealed around three edges form a pocket containing a self-coiling metal strip which grips around the arm of the wearer. The pocket also contains a series of high-intensity LEDs interposed between the metal strip and one of the flexible strips 1, which is reflective but allows light from the LEDs to pass through rendering the wearer more visible at night. The LEDs are powered by cells contained in a two-part housing 9 which also contains a microchip to supply pulsed power to the LEDs so that they are caused to flash at about one per second.

Abstract: A housing comprising mutually engageable top and bottom parts 4 and 5 which contain a lightweight ceramic plate magnet 6 capable of producing a high field strength. A keeper plate 7 is placed on top of the magnet overhanging its longitudinal edges so that blood flowing beneath the device successively encounters alternating north-south-north magnetic poles. The housing is secured to the body by a strap 2 which is held between opposed lands 20, 31 and 19, 32.