new in box vtech digital audio monitor A set of five LED lights on the parent unit indicates the level of sound in your baby's room so you can visually monitor noise level with the receiver muted. In vibration mode, the parent unit alerts you with gentle vibrations when your baby is fussing. Simply connecting power for both units and allow 1-min for the units to link to each other. Crystal clear sound with DECT 6.0 digital technology. A fully charged battery can operate 9 to 16 hours depending on monitor's sensitivity settings. Talk from a parent unit to the baby unit (for DM221) and the other parent unit if you have two parent units (for DM221-2). You can use both of the parent unit at the same time to talk to the baby unit. only blemish would be that the shipping sticker residue stuck to the front of the package picture for reference