Emprex GPS Bluetooth Receiver IGO-08A - Manual (Page 7)

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Hardware Description
There are four LEDs to show different status:
Bluetooth（Blue）
Fast blink: Indicates this Bluethooth GPS is waiting for
pairing or master device’ connection.
Slow blink: Indicates this Bluetooth GPS is connecting
successfully.
Power LED（Red）
Lighten: Charging
Darken: Charging complete
GPS （Green）
Lighten: GPS power on
Darken: GPS power off