Chamberlain 3840 Garage Door Opener User Manual


 
38
ACCESSORIES
LOCK
LIGHT
C
LOSE
D
OPE
N
915LM
1702LM Outside Quick Release:
Required for a garage with NO access
door. Enables homeowner to open
garage door manually from outside by
disengaging trolley.
Extension Brackets:
(Optional) For safety sensor installation
onto the wall or floor.
41A5281
902LM/903LM
Wireless Keyless Entry with
Security
®
:
Enables homeowner to operate garage
door opener from outside by entering a
password on a specially designed
keyboard. Also can add a temporary
password for visitors or service persons.
This temporary password can be limited
to a programmable number of hours or
entries.
373LM
3-Button Security
®
Remote Control :
Includes visor clip.
2 & 3 Door Multi-Function Wall
Control:
Ideal for homes with up to three garage
doors. Combine up to three controls into
one wall control panel for a neat compact
appearance. Enhanced functions include
Lock Feature to lock out outside radio
signals while you are away from home
and turn opener lights on or off from the
control panel.
Fingerprint Keyless Entry
:
The system uses biometric technology
that enables an authorized user to gain
access by scanning their fingerprint. The
sensor strip on the unit makes a
numeric template of the fingerprint that
is unique to that user. The unit's
memory can store up to ten fingerprints.
377LM
Garage Door Monitor:
Security for the largest door of your
home!
Tells you if your garage door is open or
closed. Monitors up to 4 garage doors
by adding additional sensor modules.
916LM
Garage Door Monitor Sensor:
Additional accessory sensor for homes
with multiple garage doors.
395LM Remote Light Control :
Enables homeowner to turn on a lamp,
television or other appliance from their
car with their garage door opener remote
or from anywhere in their home with an
additional LiftMaster Security
®
remote.
370LM
3-Button Mini-Remote Control with
Security
®
:
With key ring and fastening strip.
379LM-10
Wireless Door Control :
Push bar, light feature and auxiliary
button. Includes battery. For use as a
secondary control panel, a wired in
control panel is recommended for
proper operation.
378LM
373P
3-Button Security
®
Remote
Control :
Includes visor clip.
975LM
Laser Park Assist:
Laser enables homeowners to precisely
park vehicles in the garage.
990LM
Surge Protector:
The Garage Door Opener Surge
Protector is designed to protect
LiftMaster
®
garage door openers against
damage from lightning and power
surges.
ENROLL
FAIL
RETRY
SEND
PASS
READY
ENROLL