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To prevent possible SERIOUS INJURY or DEATH from electrocution:
•  Be sure power is NOT connected BEFORE installing the receiver.
To prevent possible SERIOUS INJURY or DEATH from a moving gate 
or garage door:
•  ALWAYS keep remote controls out of reach of children. NEVER 

 permit children to operate, or play with remote controls.

•  Activate gate or door ONLY when it can be seen clearly, is properly 

adjusted, and there are no obstructions to door travel.

•  ALWAYS keep gate or garage door in sight until completely closed. 

NEVER permit anyone to cross path of moving gate or door.

ATTENTION 

AVERTISSEMENT 

AVERTISSEMENT 

AVERTISSEMENT 

WARNING 

CAUTION 

WARNING 

WARNING 

WARNING 

PRECAUCIÓN 

ADVERTENCIA 

ADVERTENCIA 

ADVERTENCIA 

UNIVERSAL RADIO CONTROL

OWNER’S MANUAL

MODEL 355LM SECURITY

®

 RECEIVER ONLY

MODEL 355-2LM SECURITY

® 

(WITH 2 REMOTE CONTROLS)

MOUNTING RECEIVER

1. Disconnect power to the garage door opener.

2. Fully extend antenna wire below bottom of case as shown.

3. Mount the receiver directly onto the garage door opener with the clips 

provided (Figure 1).

OR

 

Attach to a ceiling/inside wall of the garage with connecting bell wire 
(not provided). Fasten the receiver to the ceiling or inside garage wall 
with dry wall screws provided (Figure 2).

NOTE:

 Transformer Model 85 or 95 is required if your residential garage 

door opener is a LiftMaster, Chamberlain or Sears.

INSTALLATION USING CLIPS 

1. Loosen the three terminal screws on the receiver (labeled 1, 2 and 3) 

(Figure 1). 

2. Insert one end of a mounting clip under each terminal. Do not 

re-tighten at this time.

3. Loosen the three terminal screws on the garage door opener used for 

push button controls and radio power.

4. Leaving the push button bell wire in place, insert the other ends of the 

mounting clips under the garage door opener terminal screws.

NOTE:

 If the number sequence of the garage door opener terminals does 

not match the receiver, turn the receiver around (so back is facing out) 
and complete the connection.

5. Re-tighten the terminal screws on the garage door opener and 

receiver. 

6. Reconnect power to the garage door opener. 

NOTE: 

If the receiver push bar does not light, use Transformer Model 85 

or 95.

INSTALLATION USING BELL WIRE 

1. Attach one end of 3-strand bell wire (not provided) to receiver 

terminals 1, 2 and 3. 

2. Connect the other end to the three garage door opener terminals used 

for push button controls and radio power. 

3. Use insulated staples to secure bell wire between receiver and garage 

door opener (Figure 2).

4. Reconnect power to the garage door opener.

NOTE: 

If the receiver push bar does not light, use Transformer Model 85 

or 95.

INSTALLATION WITH TRANSFORMER

1. With the transformer, use a 2-wire connection only. 

2. Attach wire to receiver terminals 1 and 2 and to the garage door 

opener terminals used for push button control. 

3. Plug the transformer into receiver and 120 Volt outlet (Figure 3).

Antenna Wire Fully Extended

®

Radio Power

Push Button

Common

Garage Door

Opener Terminals

Garage Door

Opener Terminals

1

2

3

®

Transformer

3

2

1

Antenna Wire 
Fully Extended

Radio Power

Push Button

Common

1

2

3

Garage Door

Opener Terminals

®

Figure 1

Figure 2

Figure 3

NOTE: 

Transformer Model 85 or 95 is required if your residential garage 

door opener is a LiftMaster, Chamberlain or Sears.

STOP

This product should be used only in connection with 
garage door openers equipped with photo-eye safety 
sensors. If your garage door opener does not have 
photo-eye safety sensors, you should consider a 
replacement garage door opener. Please go to 
www.liftmaster.com to find a local LiftMaster dealer 
or call 1-800-528-9131.

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