Weitech 0220-A 1500-Sq. Ft. Plug In Pest Repeller with AC Adapter and Battery Back Up Repels mice and insects with ultrasonic sound waves Plugs into electric outlet or operates with 9-volt battery (not included) Portable for tents, RVs, campgrounds and home, office, workroom 1,500-square-foot range; won't harm pets and children Rugged plastic case; 4-3/4 by 2-3/4 by 2 inches