Your bttn has 6 multicolor LEDs inside, around the bttn cap, and one LED showing power status inside the bt.tn logo. These are used for showing the bttn's status and activity. bttn Mini has nearly identical signals, but the device has 4 LEDs around the cap instead.
All LED signals are explained in the User manual:
LED 1 blinking yellow = Booting up and trying to connect. LED 1 turns green and turns off when your bttn is ready for use.
(In firmware 201412 this is shown with one circling yellow instead)
After pushing the bttn:
One circling yellow = Working, wait
Green ring = Positive result
Red ring = Negative result
Yellow ring = Wait, going back to idle
Wi-Fi, 6 blue LEDs: Wi-Fi setup mode (AP mode) active. Broadcasting bttnconf network.
Mobile data, 1 - 5 blue LEDs: APN mode active, showing signal strength. 1 x blue = poor ... 5 x blue = excellent.
Mobile data, LED6 green: APN settings received successfully.
LEDs 1 - 5 flashing red = Error code 1 - 5. Count the number of red LEDs and see the model specific user manual or the table below for the error code's meaning.
|Error code||Classic Mobile data||Classic SIGFOX||Classic Wi-Fi|
|#1||SIM card has PIN/PUK, SIM card not found, or hardware error.
|#2||Power supply error.||Power supply error.
||Power supply error.
|#3||Connection error at bearer level.||Connection error at bearer level.
||Connection error at bearer level / DHCP fails.
|#4||Connection error at protocol level. Cannot contact bt.tn server.||Connection error at protocol level. Cannot contact bt.tn server.
||Connection error at protocol level. Cannot contact bt.tn server.
|#5||Server rejected bttn||Server rejected bttn or response was not received
||Server rejected bttn