$21.75The design idea was to use the simplest shape possible and let the colors do the talking. We began with a block shape and then added the few necessary functional elements; the curved underside, the oversized rubber button and the groove for attaching the elastic cord. Specifications: 1 front light (white LED) and 1 tail light (red LED). 3 modes: Slow flashing, fast flashing and steady light. Batteries: 2 x CR2032 in each light body. To change the batteries, loosen the screws on the bottom. ...