The Vtech VM321 2.4GHz Frequency Hopping Digital Spread Spectrum system digitally transmits both the audio and video signals. No annoying white noise sound. You only hear the sounds coming from your baby. All transmissions are encrypted for your privacy and security. With up to 22 frames per second of full color, dynamic frame rate video provides excellent viewing of all the action in the baby's room. Remotely communicate with your baby from the parent unit to the baby unit. Soothe your baby from another room or even from outdoors.