[ Long Range ] The VTech BM1000 Audio Baby Monitor's dependable long operation range covers up to 300 metres, lets you go about your day and stays connected with your baby from another room or even from the yard [ DECT Technology ] Digital transmission providing superior security and sound quality-no annoying white noise [ Easy Set-up Plug & Play ] Simply Install the supplied rechargeable batteries into the battery compartment, connecting power for both parent and baby units, allow 1-min for them to link to each other [ Easy to Use ] 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 [ Easy to Use ] 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 [ Sound Indicator ] 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 [ Sound Alerts ] The parent unit emits different alert tones for situations needed your attention: Low battery or Out of range, etc.