【High-Definition Display】Featuring a 5.5-inch 1080P HD screen, this baby monitor provides crystal-clear visuals for optimal infant supervision. 【Two-Way Communication】Engage in real-time, two-way audio conversations with your baby, offering comfort and reassurance from anywhere in your home. 【Night Vision & Temperature Monitoring】Advanced night vision capability and built-in temperature & humidity sensors ensure round-the-clock monitoring and comfort for your little one. 【Multi-Camera Expandability】Connect up to 4 cameras to a single monitor, with split-screen viewing capability for simultaneous multi-room monitoring. 【Soothing Features】8 built-in lullabies, including white noise and nature sounds, help create a tranquil sleep environment for your baby. Specifications: Display: 5.5-inch LCD with 1080x1920 resolution Frequency: 2.4GHz FHSS Transmission Range: Up to 131ft (40m) indoor, 850ft (260m) outdoor Monitor Battery: 5000mAh Camera Resolution: 1080P Night Vision Range: 15 ft (5 meters) Monitor Dimensions: 168.7 x 90.8 x 19.9 mm Camera Dimensions: 105.5 x 90.25 x 75 mm Monitor Weight: 249.5g Camera Weight: 178.2g Operating Temperature: 0-40℃ Humidity Range: 5% to 90% relative humidity Power Supply: 5V, 1500mA (both monitor and camera)