Electronic Electromagnetic Rechargable Cockroach Pest Bed Bugs Repeller Device Tool Easy Installation White Drives away cockroaches effectively. Need to use continuously 2-3 weeks, then it can achieve the best result. Non-toxic, eco-friendly and does not harm human or animals. Green LED shows it is power on and red LED indicates it works. Ideal for use in home, food service outlets, hotel, warehouse, farm buildings, kennels and stables, etc.