... .CE&RoHS certificate 4. Safe and portable Electronic Mosquito Control UL&GS Plug (GH-321A)The repeller is effective in controlling mice,rats,mosquitoes, Cockroaches ... not interfere with televisions, radios, electronic burglar alarms, fire or smoke detectors, pacemakers, hearing aids or electronic equipment. Electronic Mosquito Control UL&GS Plug (GH-321A)