-LED not lit: No power to modem
-LED Blue (Solid): Modem is on and you’re roaming
-LED Green (Solid): Modem on and fully charged
-LED Green (Blinking): Modem is in hibernate
-LED Red (Blinking): Battery is critically low
-LED Amber (Solid): Charging
-LED Amber (Blinking): Modem error
The battery on the MiFi 2200 is rated for 4 hours of continuous use.