TWO-WAY AUDIO: Built-in speaker and microphone, comfort your baby with the sound of your own voice by using the two-way talk back system. And the advanced night vision with 8 built-in infrared LED beads extend the viewing distance to 5 meters in pitch dark with no light pollution, so your baby will not be disturbed by LED glare. Large LCD Screen & Night VisionELEAD Baby Monitor provides 3.5 Inches High Definition Color LCD Display, 2.4GHz FHSS Technology provides clear real-time video and audio of your unattended baby any time any where.NOTE: The monitor can work without plugging in after you full charge, the camera need to be plugged in at all times. Just plug in the charging cable then press the button ON/OFF then you can use it to monitor your kids anytime. Easy to UseYou don’t need to buy batteries for our ELEAD Baby Monitor.