This Safety 1st High Def Digital Baby Monitor is a portable device with a 900MHz frequency and a digital display. It has a range indicator and a battery warning, making it a reliable option for monitoring your baby. The rechargeable battery is convenient for on-the-go use, and the device also features a light indicator. This pre-owned monitor is being sold as is, and while it has not been tested, it is sure to provide peace of mind when watching over your little one.