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How the system works

*   The combination of sensors depends on the package you purchased.

DM271 Baby monitor

Receive alerts on your 

parent unit when there’s 

activity in your child’s 

room – from an open door 

or window to movement in 

the crib.

Motion Sensor

Lets you know when 

there are visitors, 

intruders, or pets 

moving around your 

home.

Open/Closed Sensor

Apply this magnetic  

Open/Closed Sensor to a 

door, window, or medicine 

cabinet to know if it is 

open or closed. 

4

 Check and locate

Check the motion sensor 

before use

Test the sensor signal 
strength

NOTES

If 

No signal

 or 

Weak signal

 

message is displayed in sensor 

setup mode, or if you do not 

receive an alert when you open 

the door, move the base closer to 

the mounting location or move the 

sensor closer to the base.
Use adhesive tape to hold the 

sensor temporarily in place.

Use your parent unit to enter 

the 

Sensor settings

 menu, and 

then select the 

Check signal

 

menu. Follow the steps to test 

the sensor’s signal strength, and 

then exit the sensor setup mode. 

Make sure there is a good signal 

received when there is motion.

Refer to 

Sensor notifications 

section in the User’s manual for 

the alerts.

If your package includes 

a Motion Sensor, please 

read the following 

section.

Motion Sensor 

installation

1

 Parts checklist

1 set for DM271-110

Motion Sensor

Screw for 

mounting 

brackets x 2

Anchor for 

mounting 

brackets x 2

Open the battery 

compartment case

2

 Power

The Motion Sensor detects motion 

with one-minute cool off time. 
Once motion is detected, the 

sensor will only start to detect 

motion again after one minute.
The Motion Sensor is more 

sensitive in detecting motions 

crossing the space in front of the 

sensor than that moving towards 

the sensor.

The Motion Sensor can detect 

motion occurring at distances up 

to 

40 feet (12 meters)

 when it is 

mounted at a height of 

7.9 feet 

(2.4 meters)

.

It is recommended to mount the 

sensor at the height between

  

6.2 feet (1.9 meters)

 and

 7.5 feet 

(2.3 meters)

 for optimal detection 

coverage.

For motion detection of babies 

or pets:

If you use the Motion Sensor only 

to detect the motion of babies or 

pets, you can mount the sensor 

at a lower position to shorten 

the minimum distance before 

reaching the detection area. It is 

recommended to mount it at the 

height 

3.3 feet (1 meter)

 for optimal 

detection of babies or pets.

Up to 34.4 

feet  

(10.5 meters)

Side view

Detection 

area

78

o

Top view

Shooting area

19.7 inches

60 degrees

22.8 inches

Shooting area

19.7 

inches

50 degrees

18.3

inches

63 inches

87

o

Detection 

area

1.3 feet  

(0.4 meter)

10

o

Height: 6.9 feet (2.1 meters)

Height: 6.9 feet (2.1 meters)

Detection 

area

78

o

87

o

Detection 

area

0.7 feet  

(0.2 meter)

10

o

Height: 3.3 feet (1 meter)

Up to 16.4 

feet  

(5 meters)

Height: 3.3 feet (1 meter)

Top view

Side view

Baby Monitor installation

1

 Parts checklist

2

 Connect

Parent unit

Test your baby monitor

3

 Check and Locate

3

2

THIS SIDE UP

3

2

THIS SIDE UP

3

2

THIS SIDE UP

3

2

THIS SIDE UP

Battery compartment cover

Battery

Parent unit adapter

Baby unit

Baby unit adapter

Positioning your baby monitor

Install the battery

6

2

5

1

8

4

7

3

6

2

5

1

8

4

7

3

6

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5

1

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1

8

4

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3

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1

8

4

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4

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3

CAUTION

Keep the baby unit out of the reach of the baby. Never place 
or mount the baby unit inside the baby’s crib or playpen.
Do not expose the baby unit to extreme heat or direct sunlight.

1 set for DM271/DM271-102/DM271-110

At least 1 meter 

(3 feet)

At least 1 meter (3 feet)

Press 

 to turn on the 

projector. 
It projects some colorful 
images to the environment. 
Adjust the angle of the baby 
unit so that the images are 
clearly projected to the 
ceiling or a wall.

At least 1 meter 

(3 feet)

At least 1 meter (3 feet)

Connect the baby monitor

3

 Motion Detection

NOTE

The numerical values in the 

illustrations are for conceptual 

reference only. The actual angles 

and distances may vary upon the 

change in the mounted height of 

the sensor.

Install Motion Sensor Battery

NOTES

Use only CR123A Lithium Battery.
When inserting Battery, ensure 

polarities are correct.
The Motion Sensor is already  

pre-registered to the baby monitor.
For proper operation, use battery 

within the following temperature 

range: 0°F (-18°C) and 120°F (49°C).


6

2

5

1

8

4

7

3

6

2

5

1

8

4

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3

Unscrew.

6

2

5

1

8

4

7

3

6

2

5

1

8

4

7

3

Lithium battery

Double-sided 

mounting tape

Screw for  

back cover x 3

Anchor for 

back cover x 3

Mounting bracket 

on mounting base 

with screw

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