The BW 4151 features a Digitally Encrypted System for Secure Digital Crystal Clear monitoring. This protects against eavesdropping and hacking for added Peace of Mind. With a handy “Walkie Talkie” Function, you can now talk to and soothe your baby. The BW 4151 also comes with Temperature Display with Temperature Range Alert and a selection of Lullabies include white noise to play to your baby. This system comes with a 4.3″ Colour LCD Display Receiver so that you can see and hear your child, even in darkness, with the camera’s special Night Vision feature. Night Vision gives excellent monitoring visibility without the need for the room light being turned on.