Thieves stole £405k ($500k) worth of jewellery by using a "jammer" to bypass security systems, according to the owner.

A video captured on a hidden Ring camera shows the nonchalant criminals making off with the goods.

The incident occurred at Mint Jewelers by Boodaddy Diamonds in Hollywood, Florida, USA in the early hours of September 16.

Shop owner Christopher Petrillo said the thieves stole "close to about half a million dollars."

Christopher added that the group of thieves made their way into the building through the back door.

They used a sophisticated machine, Christopher described as a "big jamming device, like a bomb almost, with 15 antennas and it was plugged into my alarm system."

Despite cutting the wires of all of the CCTV units in the building, a remote doorbell camera was still recording in the shop.

The Ring doorbell camera managed to record the whole heist in high definition.

The thieves eventually saw the camera but it was too late - while they still made off with the goods, they left DNA and fingerprints.

Further footage shows the police on the scene later in the day.