Hundreds of free intercom systems have helped to reduce distraction burglaries in part of Leicestershire by more than 20% say police.
The units allow home owners to speak with and see strangers before opening their door.
The scheme has been running for six months and police say the sharp fall in this sort of crime is very encouraging.
Around 400 units are still freely available to vulnerable people living in and around Coalville.
Police in the area are aiming to reduce the number of distraction burglaries by 30%.
Steve Hastings, Police Community Coordinator based at Coalville Police station, said: "I'm delighted with the figures so far. I mean, a 21.5% decrease in the figures so far for this sort of crime is something we dream about."