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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
The "4 4" component is the on-board BLE antenna. But there is a second one... for NFC - you see them in the 'big pic' on http://www.espruino.com/Puck.js: multiple traces (2..3) along the edge of the PCB). For range you may read up on some long range tests here and here. You find more on the Web searching for 'nrf52840 range'.