These Chicco Ultrasound Anti-Mosquito Plug-in devices function using ultrasound technology, which is unpleasant for Mosquitoes but does not cause any undesired effect on people. They are eco friendly, it is not necessary to air room after use. Ultrasounds silently repel mosquitoes with no undesired effect on baby – no fumes, no odor, no chemicals The age limit specified in the manual of 8 years is related to the operational/functional actions admitted. The ‘Operating Instructions’ are meant for the purpose of who all can ‘ operate’ the device (being an electrical device). The product can be used for 0 Months+ babies.