The Thermacell Charcoal Rechargeable Mosquito Repeller allows for up to 5-1/2 hours of protection. It is powered by a rechargeable lithium-ion battery. Charge while operating to extend run time. Audio cues and LEDs let you know you're protected and how much battery life remains. It is engineered to precisely diffuse repellent, creating a 20' zone of mosquito protection. Get max protection in 15 minutes. Includes is one 5-1/2 hour rechargeable repeller with a built-in Li-Ion rechargeable battery, one 12-hour refill repellent cartridge, and a USB charging cable.