Audio Baby Monitor with up to 1,000 ft of Range They boast a frequency response

They boast a frequency response of 80 to 40

D batteries and 9V batteries

aptX HD Battery Battery Capacity 4300 mAh Battery Type  Li-Po

Item #NPS8211

Audio Baby Monitor with up to 1,000 ft of Range They boast a frequency responseAudio Baby Monitor with up to 1,000 ft of Range, 5 Level Sound Indicator, Digitized Transmission & Belt Clip Insert alkaline batteries (sold separately) into the parent unit and it will stay on while you move it to a new room. For extended monitoring, make sure the parent unit is plugged into AC power DECT 6. 0 provides crystal clear transmission, eliminating the annoying white noise you hear from analog monitors 5 level sound indicator graphic bars