OFF! Clip-On Mosquito Repellent Refills works with OFF! Clip-On Mosquito Repellent to provide up to 12 hours of protection against mosquitoes by fueling a 360° rotating clip that uses a quiet, battery-powered fan to circulate repellent all around you. No need for any spray or liquid application. Red LED indicator light will turn on when there are approximately 3 hours of refill and battery left. Product label may vary.