Play Disc Golf at night with “ultra-bright” and “ultra-light” Throw-Lites. Just slide the battery with the smooth (+) side against the smooth side of the light. Use clear duct tape to attach the light to the golf disc. Using clear tape over the LEDs will help to diffuse the light causing it to be more of a glow instead of a beam. When finished, remove the battery from the light and wrap the battery with tape to prevent accidental discharge. As the battery ages, the LED will dim. Battery included.