Due to the DECT transmission there is an interference-free transmission and crystal clear sound. My often lying next to mobile phone does not bother at all. The supplied batteries keep super and also the reception at the edge of the range is perfect. Here again: Brand Names Are The Safer Way! The intercom function, and the stored "Heialieder" and the built-in night light are super gimmicks, which round off the baby monitor to total satisfaction. The only question I ask myself: Why Did not I already bought viiiiiieeeeel earlier?