Stay safely seen while biking with this Flashing LED Bicycle Safety Light featuring a red and yellow light with 5 bright LED bulbs that can be set to flashing or constant modes. Also great for jogging, hiking and more. Easily fastens to bicycle seat posts with included hardware. Measures approximately 4.5" x 1.75". Requires 2 'AAA' batteries (not included). Comes packaged in a blister pack.