SE FL26RY25 5-LED Red Safety Flasher with Bicycle Attachment and Arm Strap Compact and lightweight; dimensions: 2-3/4 x 1-7/8 (5) Super bright red LED bulbs with 2,500 MCD brightness (7) Assorted lighting styles; Water-resistant design Comes with yellow arm strap and bicycle attachment Requires 2 AA batteries (not included)