See also:

NISSAN Intelligent key battery discharge
If the battery of the Intelligent Key is almost discharged, the guide light (A) of the Intelligent Key port blinks and the indicator appears on the vehicle information display. See Vehicle inf ...

Never leave these keys in the vehicle.
As many as 4 Intelligent Keys can be registered and used with one vehicle. The new keys must be registered by a NISSAN dealer prior to use with the Intelligent Key and NISSAN Vehicle Immobilizer ...

NISSAN Intelligent Key™ door buzzer
The Intelligent Key door buzzer sounds if the Intelligent Key is left inside the vehicle when locking the doors. When the buzzer sounds, be sure to check both the vehicle and the Intelligent Key. ...