Ideal for hard-to-reach areas away from mains power i.e. loft spaces, shed and garages. Portable sonic repeller provides continuous output that is too high for humans and non-rodent pets to hear. Single space treatment also suitable for holiday homes and caravans in out of season periods. Welfare friendly deterrent. Low battery indicator. Battery powered - 3 x AA batteries last for over three months and provide continuous ultrasonic protection (not included).