Extended range baby alarm with superior digital transmission, DECT technology. The extremely good transmission provides a safety and sound quality with 5 levels of sensitivity (2 red / 3 green LED). There is a belt chip on the parent unit that makes it easy to carry anywhere. The parent unit has rechargeable battery included in the parent unit. The baby alarm may indicate that the baby's device is on or off, as well as a low battery and signal loss warning. The alarm can reach 75 meters indoors while it can reach up to 460 meters outdoors. When the battery has an operating time of up to 8 hours. The baby alarm from Vtech is super good and gives parents a safety.