Need help...!!!.....wireless laser security system... help

hi
salam

guyz i want to make a wireless laser security system ....

that is placed across the door if anybody cross it then it well generate a signal and the main system which is sumwhere on other place within 10 feets catch that signal and the turn on the buzzer.... ....

the work that i have completed is a simple laser security system now i want to make it wireless....

... i want to know the transmitter ic that will generate a signal everytime when laser is interrupted .........

my english is not so good ...sorry for inconvnience

A very cheap and simple solution would be one of those wireless doorbell, under $20 (USD). No schematic for your security sysrem, might need to invert the output, think a single transistor can be hooked up as such...