Give yourself peace of mind with VTech's Safe & Sound Digital Audio Baby Monitor. Clear transmission is ensured as it operates on DECT 6.0 technology. Share childcare duties easily with the two included parental units. These units' rechargeable batteries have 18 hours of life per charge. Hear each of your baby's movements and coos with a wide range extending 150 feet indoors or 1,000 feet outside. For baby's peace of mind, the parental units also allow you to talk back.