Different Cameras for Different Ages: Coming with 2 cameras, one pan tilt zoom and one dome camera. You may use different cameras for different children or on different situations. Care for 2 babies at a time. Never Miss an Emergency: Equipped with sound detector. Monitor would light up immediately once voice is detected. Get timely inform to your baby's crying. Temperature sensor also helps you detect if it is too hot or cold in baby room. Two-way Talk & Night Vision &Lullaby: Assuming that your little one wakes up at midnight, crying,you would see clearly what happens even in the darkness with IR night vision. Talk back and comforting baby with your voice or lullabies of this baby monitor. (Note: Talking and hearing couldn't work at the same time) Expand Up to 4 Cameras: This baby monitor set supports up to 4 cameras(Only 2 cameras are included in the package). Suitable for both small or big houses. One key switch to four pictures separately, never miss any occasion. Portable 4.3" Monitor: The baby cameras coming with a portable 4.3" LCD monitor. Easy to carry to your kitchen, garden, bedroom or living room. Built-in wifi protects your privacy, no worries about being hacked.