triple A batteries. Yes, it works well and the station is able to move around from room to room and the two hand held radios are not grounded but you charge them with the docking stations.
This baby monitor features advanced, secure digital technology for optimal clarity, performance and privacy. Exclusive sound lights alert you to baby's call, even with volume turned off. Lights intensify with baby's sound, so you're always in sync with your little one. Operates on the 900 MHz frequency, which means no interference from phones or microwaves. Extended 2000 feet range gives you plenty of room to roam. Includes one parent unit, with a convenient belt clip, to keep your hands free.