The wireless Transmitter sends a trigger signal to its Receiver which may be located as far as 120feet away. when one of the following actions takes place; 1.Sound is detected by the transmitter. 2.The button is pushed down.       may use battery or AC adaptor. 256 different codes, prevent false alarm. 2 differen sounds can be set on RX unit.

RECEIVER SIZE 108mm*66mm*32mm SIZE 204mm*157mm*66mm TRANSMITTER SIZE 80*59*27mm WEIGHT 647g RECEIVER WEIGHT 125g POWER DC 5V Adapter TRANSMITTER WEIGHT 51g FREQUENCY RANGE 40MHz ~550MHz