Across the US, countless buildings, from government offices to your next hotel room door, are protected by RFID-controlled locks. But a playful palm-sized gadget with a Tamagotchi-like interface can likely thwart the locks on many of these doors.

The $200 device is called Flipper Zero, and it’s a portable pen-testing tool designed for hackers of all levels of technical expertise. The tool is smaller than a phone, easily concealable, and is stuffed with a range of radios and sensors that allow you to intercept and replay signals from keyless entry systems, Internet of Things sensors, garage doors, NFC cards, and virtually any other device that communicates wirelessly in short ranges. For example, in just seconds, the Flipper Zero can seamlessly clone the signal of an office RFID badge tucked safely inside a wallet.

If you had only heard about Flipper Zero through TikTok, where the tool has gone viral, you might think that it was a toy that could make ATMs spit out money, cars unlock themselves, and gas spill out of pumps for free. I spent the last week testing one to determine whether the world was as vulnerable to Flipper Zero as social media made it out to be. What I found was mixed: Many of the most dramatic videos posted to TikTok are likely staged—most modern wireless devices are not susceptible to simple replay attacks—but the Flipper Zero is still undeniably powerful, giving aspiring hackers and seasoned pen-testers a convenient new tool to probe the security of the world’s most ubiquitous wireless devices.

Read more in Wired.

Read more about Flipper Zero in the post here.