THERMACELL RECHARGEABLE E55 RIVERBED W/12 HRKeep mosquitoes away with the simple push of a button. E55 Rechargeable Mosquito Repeller Riverbed provides a 28m2 zone of advanced mosquito protection. Uses a repellent which is scent & smoke free. It features a 5. 5 hour battery with 12 hours of mosquito repellent included. Audio cues and LEDs let you know youre protected and how much battery life remains. E55 creates a 28m2 zone of protection against mosquitoes 80% more area than our original line.