BATTERY: Fully charged remote has a 5 hour battery. FEATURES: Securely access features including two-way talk, lullaby selection, room temperature sensor and more. MOUNTED: It easily attaches to shelves, brackets, and more so you can have peace of mind and stay connected to your bundle of joy. BUILT-IN SPEAKER: Our monitor acts as a 2-way intercom system, allowing you to speak to your precious angel through the camera's built-in speakers. ALERT CRYING: Each baby monitor camera includes a high-sensitivity microphone that can catch the slightest sounds to alert you once your baby starts crying.