a receiver circuit that used larger amounts of regeneration in a more complicated way to achieve even higher amplification, the superregenerative receiver, was also invented by armstrong in 1922. it was never widely used in general commercial receivers, but due to its small parts count it was used in specialized applications. one widespread use during wwii was iff transceivers, where single tuned circuit completed the entire electronics system. it is still used in a few specialized low data rate applications, such as garage door openers, wireless networking devices, walkie-talkies and toys.