The Alecto DBX-88 ECO DECT Baby Monitor uses DECT technology, making it 100% interference-free. The microphone sensitivity is adjustable in 5 steps. You decide how much sound you want to hear. In addition, a number of LED lights will automatically light up as soon as sound is detected. This way, you can both see and hear that a sound is made. To reassure the little one while crying, speak to the baby through the parent unit. In addition, you can remotely control the baby monitor to sing lullabies, or to switch on the night light.A baby monitor with battery is like a smartphone that runs empty when you are playing a video. Meaning, the battery life is limited.