Noise Detection: When the noise in the baby room is below 40db for more than 20 seconds, voice will be enabled and the monitor will cancel the slight background noise, until the noise exceeds 40db, the monitor will wake up and it will let you know exactly when your baby makes any sound. Two Way Intercom: 2.4GHz digital signal, built in microphone and speaker, you can talk to your baby from a distance without running back. Wireless Point to Point Transmission: Digital signal transmission, stable without interference, digital signal encrypted transmission, good security. Night Light: This audio baby monitor has a night light, which can be controlled remotely, making it more practical and convenient to use. Long Battery Life: The built in lithium battery in the baby care device has a capacity of 500mAh, and the standby time is up to 20 hours, and the battery life is long.