unique design:
  Use of the LED dog collar need to pull out the white insulator objects.
  LED light glows and flashes in darkness.
  Helps to keep you and your dog & other pets safe during walking. 
  Provide safety for your dogs and pets while it's out alone at night.
  Easy to use: simply pushing the control button makes the light ON/FLASH/OFF, Collar  has 4 modes controlled with a switch on the collar Solid    Light, Fash Blink, Slow Blink, and Off. 
Notice:
 Batteries last  60-80 hours , battery can be changed,the kind of battery is  Button Battery.