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The Electronic Watchdog
That Never Sleeps
We protect the things that protect you.
TM
®
ED-50
2306 Airport Rd., Waterford, Michigan 48327
Phone: 248-673-9898 • Fax: 248-673-1246 • www.sti-usa.com
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Like father, like son. Introducing the next generation of Rex, the famous barking dog alarm. In addition to
the sound of a ferocious, attack dog, Rex Plus offers the sounds of the rainforest. Choose the sound that
suits you best. Try the continual sounds of the rainforest, or the option that allows you to use these same
sounds as an annunciator. Another option includes the angry, barking dog followed by the sound of a siren
for 20 seconds. Rex Plus is versatile and provides an excellent way to deter burglars, without the annoying
problems of owning a real dog. With his electronic radar eyes, Rex Plus can “see” through thick doors, walls
and glass. And once his cord is plugged into any standard 110 VAC electrical outlet, he’ll stay on duty around
the clock, indefinitely.
Rex Plus™ Features Include
•
Your choice of four sounds:
• Continuous sound of the rainforest
• Barking sound of a ferocious attack dog
• Sounds of the rainforest to announce the arrival of visitors
• Barking dog and warning siren
•
Very realistic - barking gets more frequent as intruder gets closer.
•
Switches from the watchdog to the tranquil sounds of nature with the simple slide of a switch.
•
Senses movement through walls, doors and glass.
•
Variable distance sensitivity (up to 30’) as well as volume control.
•
No installation required.
Operation Instruction
1. Insert the adaptor plug into the unit, then plug AC adapter into outlet.
2. Choose the feature you wish by adjusting the switch on the back of the unit.
a. Rainforest (sound is continuous).
b. Watchdog - Switch on this function and start detecting any intruder or large moving objects. When
the intruder is 15 to 18 feet away, unit will bark once or twice. Barking gets more frequent as intruder
gets closer.
c. Rainforest (entrance chime) - When the visitor is 15 or 18 feet away, the unit will sing the melody to
announce the arrival of visitors.
d. Watchdog and Warning Siren - When the intruder is within 15 to 18 feet, the device will bark and a
siren will alarm for 20 seconds.
3. Turn on the “VOLUME” switch and adjust the required “RANGE”.
Note: Generally, the “RANGE” is adjusted to its maximum before delivery. Therefore, it needs no further
adjustment. In case it is too sensitive, turn the knob in a counter-clockwise direction to reduce the range.
Operation Instruction Caution: Rex Plus is designed for use indoors. Generally, the unit will not bark at a
moving object behind it, but it may at certain positions. In this case, try to change its position slightly
to be most effective. The unit should be placed at a height of 3-5 feet from the floor to obtain the widest
range of detection.
Detection Efficiency
Rex Plus’s radar waves can detect through a variety of materials with maximum efficiency. The following
chart serves as a guide.
MATERIAL EFFECT ON RANGE
Glass slight reduction
Wooden Doors slight reduction
Plaster Walls medium reduction
Metal (steel, bronze, heavy reduction
aluminum) (detection is possible when metal is
moving or there is a clearance.)
Curtain Material slight reduction
Fiberglass or Plastic full detection
Paper Cartons slight reduction
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Electrical Specifications
Rex Plus consumes very little electrical power when in the “detecting” mode, but uses more power when barking.
Power Supply 12 VDC, 100 mA
Frequency 2.4 GHZ
Net Weight (lbs.) 2.2 lbs., including AC adapter
Power Detecting 0.22 Watts
Power Barking 2.6 Watts
Size (inches) 6” long x 5 1/8” wide x 7 1/2” high
General Performance
Distant approach single or several barks
Medium distance single/multiple barks
Close approach fierce, continuous barks
Warranty
Safety Technology International, Inc. warrants to the original consumer/purchaser that this product shall be
free of defects in material and workmanship under normal use and circumstances for a period of ninety (90)
days from the original date of purchase.
Please mail or fax (248-673-1246) card below to STI or fill out the electronic warranty
form at www.sti-usa.com/wc14.
WARRANTY CARD
Please complete and cut out form. Mail or fax to STI.
Name: __________________________________________________________
Address: ________________________________________________________
City: ______________________________ State: __________ Zip: __________
Phone: __________________________________________________________
Place of Purchase: ________________________________________________
Purchase Date: __________________________________________________
Comments: ______________________________________________________
________________________________________________________________
________________________________________________________________
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POWER
SWITCH
RF
TX BURST
RF
TX/RX
RANGE
DETECTION
SIGNAL
PROCESSOR
V
OICE
PROCESSOR
AUDIO
AMPLIFIER
SOUND
SELECTION
SPEAKER
FCC Approval
This device may not cause interference. This device must accept any interference, including interference that may cause
undesired operation of the device. Changes or modifications not expressly approved by the manufacturer could void the
user’s authority to operate the equipment. 1. “Watch-Dog” is a structure of “RF TX/RX” device that transmits an RF signal,
then detects the reflecting RF signal and senses the range. It then converts the signal to an audio alarm voice. The carrier
frequency is generated by an LC resonant circuit “TR8”, “L3”, “C34”. Center frequency is 2.4G Hz, ASK/100% modulated, 4K
modulation signal, 1/10 duty. 2. The power switch is used to control the “Watch-Dog” system power. 3. Within the signal
processing module, there is a “RF TX burst” section. It will generate a burst pulse to control the RF module and then turn
the RF transmission on. 4. When an object comes within detection range, it will reflect the RF energy back to the RF receiver.
5. The RF receiving module will demodulate the RF signal to the “signal-processing” module. 6. The range detection section
will process an incoming signal and then send it to the “voice processor”. 7. The “voice processor” will send a different
sound based on the “sound selection switch”. It will transmit from the “audio amp” to the speaker.
Made in Taiwan.
POSTAGE
REQUIRED
2306 Airport Rd.
© 2004, ‘07 STI 05/07
Waterford, MI 48327
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