Blue Light EL Hoodie Jackets are the wave of the future. EL Wire glows up & down the zipper, plus around the hood to frame your face. Black fabric is lightweight & comfortable. EL Hoodies take nights out on the town to the next level. To activate your EL Hoodie, load batteries provided & press button on battery pack for 3 functions: blink, flash, and chill steady lighting. Store your battery house in the small pocket located inside jacket. Blue Light EL Hoodie Jackets come with 2 replaceable AA Batteries. EL Hoodie sizing is unisex. If buying for men, we suggest buying 1 size up, for EL Hoodie may run small on male customers.