One-way CommunicationThe parent unit can be activated by baby's crying and parents can check the signal status via the indicator lights, so that dad or mom can go to comfort baby in time.Easy to UseThe volume of parent unit and baby unit can be adjusted freely by rotating the gear, and both have switch to turn on/off the baby monitor and select channels, easy to use.Convenient to CarryBackside clip design allows parents fix the parent unit to pocket stably when doing some housework, very convenient to monitor baby status anytime anywhere.Battery Powered DesignThe parent unit and baby unit both can be powered by 3 * AAA batteries(not included), low power consumption and long working time.Specifications:Color: Yellow Channel: 2 Transmission Range: 100M in open area, indoor range depends on actual environmentPower Supply: 3 * AAA batteries(not included)Packing List:1 * Parent Unit1 * Baby Unit