Features: Wireless Audio Baby Monitor: Adopts 2.4G wireless technology, no interference and effective transmission range is up to 150-200M in open area, which enables you to hear your baby’s voice clear in a certain distance. Two-way Talk Function: With built-in high sensitive microphone and speaker for two-way talk. You can hear your baby’s voice clearly and use your voice to comfort her/him instantly when they are crying. Easy to Use: The volume of parent unit and baby unit can be adjusted freely by pressing the left or right button, and both have power switch to turn off the baby monitor to save power when not in use. Convenient to Carry: The parent unit has a backside clip, which allows parents to carry it conveniently when doing some housework, very considerate design. Dual Power Supply Ways: The parent unit and baby unit both can be powered by 3 * AAA batteries(not included) or DC 5V 1A power adapter(included), more flexible to use. Specifications: Transmission Frequency: ISM