Sony NTM910DUAL 900MHz baby monitor dual receiver bundle # Includes one transmitter and two receivers # Built-in rechargeable battery in the receiver # Voice activation mode # Out of range indicator # Water resistant receiver (not meant to be immersed in or come into continuous contact with water) # Belt clip # AC/DC operation (operates on both your standard household current or supplied rechargeable batteries) # 900MHz technology extends the range of the babycall monitor allowing you take the receiver farther from the nursery and still hear activities in the nursery # 27 channels minimize interference: the babycall monitor uses the FM transmission system with channel selector to locate the clearest channel, helping to eliminate interference for clearer communication # 5 Sound-Sensor activity lights: alerts you when your baby is making sounds, when the receiver is out of range, and even when the battery is low # Flexible round antenna system # Speaker type: mono # WhiteSYNTM910DUAL