Bright-Way LED Clip-On Cap Light is perfect for baseball-style cap brims. It fits under brim and features two modes. LED Bulbs last over 10 hours in runtime and have 80 lumens of brightness. It is approximately 3.25" x 2" x 0.50" in size and comes packaged in a 6" x 5.75" blister pack. Uses 3 - AAA batteries - included.