How It Works: Contactless Cards 💳

Added: 2026-06-02

[00:00:00]Can they steal your money just by holding a phone next to your pocket? The hidden tech inside contactless cards will absolutely shock you. Think about it. Your card has no battery or power source. So, how does it talk to the reader?

[00:00:13]Under a strong light, you'll see a hidden wire loop inside. This is an antenna. When you bring your card close, the reader emits an electromagnetic field. This field instantly powers up the tiny microchip inside using electromagnetic induction.

[00:00:29]The card literally steals energy to turn itself on. Once powered, the chip sends a secure, encrypted code. So, can someone steal your money in your pocket?

[00:00:40]Highly unlikely because the card must be within 4 cm. Mind-blowing, right? If you love uncovering the hidden logic behind everyday tech, subscribe and let's decode the world together.