A Vietnamese firm has claimed to have bypassed Apple’s Face ID, the facial recognition technology equipped on the iPhone X, the latest Apple smartphone, with a $150 3D-printed mask, thepaper.cn reported.

It can be seen from the demonstration video filmed by the Bkav that a mask with a cover is placed in front of an iPhone X. When the cover is removed, the device is unlocked by the 3D-printed mask.

At the launch event, Apple stressed that the iPhone X could not be unlocked by 3D-printed masks and that Face ID can distinguish a real face from masks thanks to artificial intelligence.

In addition, Face ID looks for eye movement, Apple said. According to the tech giant, the facial recognition system is 20 times more secure than its fingerprint recognition feature Touch ID.

However, the company researchers hacked the technology with only a $150 3D-printed mask. The company has not yet explained how they did it.