Bluefruit EZ-Link – Bluetooth Arduino Serial Link & Programmer – We are excited to add another product to our growing Adafruit Bluefruit line, this time it’s the Bluefruit EZ-Link: the best Bluetooth Serial link & programmer ever made (module and shield). Like you, we have purchased all sorts of Bluetooth devices with high expectations – we just wanted something that worked! But nothing ever did exactly what we wanted: there was always some configuration modes to wade through, and trying to reprogram an Arduino is impossible. So we did what we always do, we went in and engineered something better. Something that works!