Youll no longer have to worry about unwanted visits from mice and rats its ultra high warning sounds keep rodents away from your garage house shed barn attic etc starts to work straight away and requires no mains supply and no mounting sphere of action approx 40 m the integrated warning sounds every 30 seconds 20 prevents mice and rats from getting used to the noise when in constant use can be used for up to 6 months on one set of batteries depending on the batteries