OFF! Clip On Mosquito Repellent Fan Unit 1 ea ( Pack of 3) No Skin Application- OFF! Clip-On Mosquito Repellent provides protection without putting anything on your skin. No spray, no mess. Indicator Light- A red indicator light will turn on, which indicates theres approximately 3 hours of the refill and battery left. Use refill within 14 days of opening. Easy to Use- Whether you clip it on or set it next to you, the unit offers protection thats just a click away. It also contains a 360 rotating clip for additional comfort. Fan Powered- The quiet, battery-powered fan circulates repellent all around you. Batteries are included. Refillable- Each refill disk provides up to 12 hours of head-to-toe mosquito protection and will work with previous and new designs of the OFF! Clip-On Mosquito Repellent unit. One refill is included with the unit. Additional refills are sold separately and each pack contains two repellent disks (each disk provides up to 12 hours of protection). Use each refill within 14 days of opening.