transmitter+receivertransmitter working voltage:≤12vtransmitter power consumption:≤10mwreceiver working voltage:ac(110-220)v/(50-60)hzsound volume range:25-75dbworking frequence:315mhz/433mhzmaterial:absnet weight:0.12kgtransmitter size:85mmx38mmx21mmreceiver size:92mmx80mmx33mmpacking:48pcs/carton...