 Many electronics boards with wireless capability, like Wi-Fi or Bluetooth, come with these silver modules. So what secrets are hidden behind this shiny armor? To remove it, I'll try melting the board's solder with a hot air gun. If we want to get in there even faster, we can always get a little more direct heat from our friend, Mini Hotplate. Once the board fully heats up, we can gently remove the tin, being careful not to disturb the components underneath. Inside, we find the ESP8266 itself, a timing crystal, and an SPI flash chip to store the board's program. You can see where the tin was soldered to the ground plane, making it act like a Faraday cage, blocking outside radio frequencies. You can also see there's one gap in the cage perimeter. This is where the antenna trace went outside to talk to the world.