From the manufacturer

Tips on product's operations

Simply connecting power for both units and allow 1-min for the units to link to each other.
Crystal clear sound with digital wireless technology. The best reception can be obtained by placing units away from cordless phones or other electronic devices, and make sure the parent unit is 3 feet (1 meter) away from the baby unit.
The parent unit is operated with the rechargeable battery or by AC power. A fully charged battery can operate up to 8 hours. As it takes up to 10 hours for the battery to be fully charged, turn the parent unit off while charging can help shorten the charging time.
The parent unit is preset to plays an audio safety reminder when it is connected to a baby unit. You may turn it off by press and hold the volume down key for 8 seconds.

Other product features people love

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.

The speaker volume on the parent unit is easily controlled by pressing the up or down arrow keys. When the parent unit is in mute, the visual sound indicator will still indicate the sound detected from the baby unit.

The parent unit emits different alert tones for situations needed your attention.

Low battery tone: Beeps twice every 10 minutes when the battery is low.

Out of range tone: Beeps three times every 30 seconds when there is no link between the baby unit and parent unit, or when the parent unit is out of range from the baby unit.

Lights on steadily in green when the parent unit is on and linked to the baby unit.

Flashes in green when there is no link between the baby unit and parent unit, or when the parent unit is out of range from the baby unit.

Product Description

Hear your child even when you're in another room, and rest assured you'll know when they need you with the DM111 audio baby monitor. Totally digital transmission cuts down on annoying static and feedback from other wireless devices, so the only sounds you'll hear are your baby's. The VTech Digital Audio Monitor - DM111 Features: Digital Wireless Transmission eliminates background noise, so you can rest assured the only sounds you - and only you - will hear are your baby's.; 5-Level Sound Indicator - LED lights on the parent unit indicate the level of sound in your baby's room so you can visually monitor the noise level with the unit muted.; Belt Clip - Clip the parent unit to your belt and take advantage of the extended range and battery-powered operation.; Out of range indicator; High sensitivity microphone;

Manufacturer Contact Information

Customer support number - 1-800-595-9511