These are several compatible devices which use keyed controls using inexpensive modules. They were constructed in order to get experience in using radio frequency communications in PICAXE devices.The RF components use AMK (On-OFF) keying in the 433.92 MHZ ISM band, which may have a range up to 1 Km.
The RF modules are apparently made by the Wenshing company. Their transmitter module is part TWS-BS and the receiver RWS-371. In the U.S. they are sold by SparkFun, but I re-used surplus boards from junk assemblies for the two hand-held transmitters.
The main problem to be solved is the frequent bursts from other sources, and the continual noise pulses from the receiver.
The transmitters provide short bursts with a format which may be used for any of the receivers. The action taken by a receiver then depends on the command in the message. This may be easily changed in the PICAXE program.
For complete details please see my web site: http://projects.worsleyassociates.com/RF_Projects