Highlights Install two "AAA" batteries for Receiver & Transmitter Move the switches to "1" & "2" ("0" on Transmitter is OFF, 1 is low sensitivity, 2 is high sensitivity. "0" on Receiver is OFF, 1 is low volume, 2 is high volume) Place the Transmitter near the baby, & place the Receiver to any locations within 80-100 meters (The LED light will always flash one time on very 10 seconds, if out of signal cover range the LED will not flash) Once the baby is crying or something making sound, the receiver will make the crying noise. Please change the batteries if the products out of services. The products are not toys, please keep out of children's touch. Specifications Shipping Weight (Kg):0.1362 Dimension (CM):20.6 x 15.5 x 3 Package Contents 1 Transmitter 1 Receiver