The motorola mbp11 baby monitor has a sensitive microphone and 18ghz technology provides clear sound you can rest assured that when your baby needs you you will hear them loud and clearthe mbp11 has been engineered by motorola with you in mind with 5 led alerts for sound activated lights data encryption for security and a 300m range with quotout of rangequot warning you can monitor and attend to calm your child from a different roomthe parent unit has a rechargeable batter