The Angelcare Baby Monitor AC310-D with a 4.3"/11 cm display not only provides safety for your baby but also gives you peace of mind. With a range of 250 m (in open areas), the baby monitor can be used in different rooms. If the receiver and transmitter are too far apart, you will receive a notification from the range control. The monitor also requires attention regarding the battery; before it runs out, you will receive a warning from the battery indicator control. You can expand the Angelcare Baby Monitor with up to 4 cameras. For monitoring room temperature, data is recorded for up to 2 months. The Angelcare AC310-D features secure digital transmission (FHSS technology). For further expansion of your device, the wired sensor mat AC-SP is compatible.