The Graco 2M19VIB Baby Monitor helps you keep a close watch on your infant even from a distance. It makes use of 900 MHz wireless frequency to facilitate communication between the parent unit and the child unit. The Graco baby monitor features sound lights that help you keep a close watch on your baby. In case you miss the clear audio signal, sound lights draw your attention to your babys needs. Also, the monitor boasts of a 2000-feet range that lets you move to any part in and around your house without losing touch with your infant. Further, the 900 MHz frequency doesnt interfere with other wireless devices like routers, cordless phones and even microwaves. When the battery starts to drain out, an alarm keeps you updated of the development. Other thoughtful additions include the rechargeable parent unit and the exclusive vibration notification technology.