The vicks vapo pad rosemary lavender come in a pack of 7 and each scented pad works for up to 8 hours suitable for use with vicks humidifiers the scent pads work with heat to gradually release soothing vapours the scented pads provide your child with 7 nights of comfortable breathing and a good nights sleep features work with heat to gradually release soothing aromatic vapours pack of 7 each scented pad works for up to 8 hours suitable for use with vicks humidifiers rosemary and lave