1. Audio monitor uses 2.4GHz wireless technology, which could provide excellent stable connection and safe private signal. It keeps your transmission secret and secure. 2. Two way voice talk: The system allows you to communicate with your baby and soothe your newborn distress with the sound of your voice from another room. 3. Belt clip design allows parents the convenience to keep the unit with them when they move around the house, or in other situations where they could not keep it close. 4. Powered by 3 x AAA batteries (not included) or 5V output AC power adapter. 5. Intercom distance: 10m