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Alert System Type
Driveway Alert
Entry Alert
Motion Alert
Sensor Type
Vehicle / Driveway
Infrared (IR)
Radio Frequency (RF)
Battery Operated
Outdoor Rated
Ease of Installation
Beginner (Installs < 10 minutes)
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Wireless Infrared Transmitter Sends Signals up to 2,000 Feet to your Optex Wireless 2000 or 1000 Receivers
Optex TD-20U Indoor/Outdoor Wireless Infrared Transmitter
Optex TD-20U Indoor/Outdoor Wireless Infrared Transmitter
Optex TD-20U Indoor/Outdoor Wireless Infrared Transmitter
Item# 7136ST
Price: Normally $90.00 
Hot Deal $70.47
Free shipping on orders over $175 - See Details


  • 2000 ft. line-of-sight transmission range
  • Uses passive infrared to detect motion and send RF signals to receivers
  • Weatherproof housing (IP54 rating) for both indoor and outdoor use
  • Selectable 50 ft. Long Range or 17 ft. Fan (Wide) detection pattern

Essential Info

The Optex TD-20U Indoor/Outdoor Wireless Infrared Transmitter is an accessory used with the Optex Wireless 1000 and 2000 systems to enhance their effectiveness. With a built-in infrared sensor, this wireless transmitter can send alarm signals up to 2,000 feet back to Optex receivers.

The Optex TD20U infrared sensor and wireless transmitter has two settings for the infrared sensor: "Fan" and "Long Range Beam". The Fan setting is ideal for door and entrance ways, or even as a motion sensor mounted in the corner of a room. In the Fan setting the Transmitter will use a wide 17 foot detection pattern to track motion. The Beam setting will monitor up to 50 feet in front of the sensor making it ideal for wide driveways, parking lots or even as a perimeter sensor for your property.


  • Detection Method: Passive infrared
  • Detection Range: 50ft (15m) long range or 17ft (5m) fan pattern
  • Detection Angle: 90 degrees vertically & ±5 degrees horizontally or ±5 degrees vertically & 90 degrees horizontally
  • Power Source: 9V alkaline battery (not included)
  • Battery Life: Approx. 2yrs [250/day at 70°F (20°C)]
  • Visible Indicator: Red LED
  • Transmission Frequency: 418MHz
  • Transmission Range: 2000ft (line of sight)
  • Operating Temperature: 15°F~120°F (-20°C~+50°C)
  • Water Resistance: IP54
  • Suitable for use: Outdoor/Indoor
  • Weight: 6.3oz (180g)
  • Accessories: Mounting screw × 2
  • Reviews

    33 Ratings
    5 star: 79%  (26)
    4 star: 12%  (4)
    3 star: 3%  (1)
    2 star: 3%  (1)
    1 star: 3%  (1)
    Average Customer Rating
    (33 customer ratings)
    Share your thoughts with other customers
    CATHERINE -- lawrenceville, GA   8/29/2013
    Product as described -
    KAKI -- mountain brk, AL   8/29/2013
    Great product. Works really well!!!
    RONNIE -- trinity, NC   6/23/2013
    All good worked just like it should have and delivered on time. Thanks
    DANIEL -- woodstock, GA   5/30/2013
    Replacement for a transmitter bought years ago and damaged by squirrels. Easy to set up. Linked with both of my existing receivers. Requires batteries about twice per year - otherwise no adjustments or maintenance necessary. The earlier model did not work well in the rain. This one seems to work fine in all weather. Overall an excellent product.
    TAMERA -- portsmouth, RI   5/6/2013
    Easy to link with the system. Best we have found.
    NORMAN -- port jefferson, NY   2/28/2013
    Works exactly as described.
    STEPHEN F -- rio rancho, NM   12/8/2012
    This item arreive in just 2 days, and is exactly what I needed. It is a replacement for a 10 year old model, and works perfectly.
    LOREN -- leesburg, OH   11/24/2012
    Got here quickly!
    ELENA -- freeport, NY   10/11/2012
    very happy with our order! Works great
    JAMES -- cresco, PA   9/30/2012
    Seems to work as advertised. Doesn't look like should be outdoors.Cheap construction, not waterproof. Put it in some kind of weatherproof container with an open front or it may not last long.
    DOW -- fairburn, GA   7/16/2012
    I received my product
    VICTOR -- hampstead, MD   7/8/2012
    The.This product is very reliable and easy to configure. This is the second motion that has been added to our loation. The first unit has performed flawlesly in all types of weather. A great security asset to our property.We are considering adding a third unit
    PAUL -- richmond, IN   1/19/2012
    Doesn't send signal when face of unit is wet....??? Otherwise, feel safer when I know there is someone/something around.
    JACK -- hillsboro, TX   1/19/2012
    While their ability to transmit signals long distance is great, their sensitivity or range was dissappointing.
    O'NEIL -- elk point, AB   1/5/2012
    Works great
    PAUL -- richmond, IN   6/23/2011
    Had to call Optex Tech Support to sync the receiver with the detector. Unit works well now.
    RYAN -- castro valley, CA   4/8/2011
    Very good range. False alarms from pets a problem so set unit up to PET ALLEY mode when used outdoors and point diagonally. Vertical aiming is good over doorways or where there are NO PETS. Do not put in direct sunlight where trees or bushes create a shadow on the lens or you will get false alarms. Correct set up and placement is very important with this unit to reduce false alarms. I played with placement for about a week to get it fine tuned. (Only put one screw in the unit when mounting until you are sure its in a good place) Very good quality product. Have been getting about 16 months on 1 9V battery. Battery low indicator sound is a huge PLUS! Highly recommend unit.
    MILTON -- rapid city, SD   3/10/2011
    We are very happy with this product. We use it in our Storage business. Great reception in most weather conditions and a great variety of adjustments for different locations and applications.
    DAVID -- houston, TX   2/12/2011
    I have them on the front and back porches of my house to let me know when someone is approaching. After some adjustment to minimize false alarms due to animals, they work perfectly. I used lithium ion batteries. Read the instructions carefully during installation to get the correct beam for the job you want to do.
    Greg -- St Louis   12/23/2010
    I bought the Optex Wireless 2000 Annunciator 9 years ago. Works fantastic. Every home should have one of these. Lets you know when anyone is approaching your yard, driveway, or door. You can even aim it towards your mailbox & it will signal you when the mailtruck arrives. I love gadgets, and this one is awesome.

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