Baby Cry Detector Item:RD-668 Classification:Baby Care Product;Baby Monitor;Baby Health & Safety Product Specifications & Features: (1)One Transmitter + One Receiver; (2)Remote Distance: 30-50M(in open area); (3)Battery Operated: use 2 "AAA" batteries for Transmitter; use 2 "AAA" batteries for Receivers; (4)Sonic Activated:upon Baby is crying or something loud voice happend around Baby,the Receiver will make baby crying sound. (5)Lovely clown design; (6)Size:10*7*3.6cm; Operation Instructions: a.Install 2 "AAA" batteries for Transmitter and Receiver seperately,move the switches to "1" or "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. b.Place the Transmitter near the Baby,and the Receiver to any location near the Mom/Dad,even in the pocket within the coverange of the singal(The LED light will always flash one time per 10 seconds.If out of signal covered,the LED won't flash.) Once the Baby is crying or making something sound,the Receiver will make the crying voice. c.Please change the batteries if the products are out of service.The products are not toys,please keep out of Baby's touch.