Calpol Vapour Plug & Nightlight Refill Pads provide continuous 8 hour release. It helps to soothe and comfort your child at night time whilst helping to clear and ease breathing. Calpol Vapour Plug & Nightlight Refill Pads is a soothing vapour plug and nightlight that lasts for up to 8 hours. It is the first ever vapour plug with nightlight to give night-time comfort to your child and is safe to use from 3 months of age. Just pop it into a socket in your child's bedroom, and then leave the gentle, reassuring glow and essential oils of lavender and chamomile to work their sleepy magic.