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Sensor Type
Door / Window
Contact Closure / Relay
Outdoor Rated
Normal State
Normally Closed
Ease of Installation
Intermediate (Installs < 60 minutes)
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No More Ugly Alarm Contact Switches!
Long Round Magnetic Contacts
SECO-LARM Enforcer SM-207WH Hidden Mount Long Round Magnetic Contact Switch, Normally Closed
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Installation Diagram Installation Examples Compact Size
SECO-LARM Enforcer SM-207WH Hidden Mount Long Round Magnetic Contact Switch, Normally Closed
Item# 7358
Price: Normally $3.99 
Hot Deal $1.69
Free shipping on orders over $50 - See Details


  • Use on closed circuit systems
  • Ideal for new construction
  • Completely hidden once installed
  • Use on doors, windows, and sliding doors

Essential Info

Eliminate the telltale signs that you have an alarm system installed. Unlike conventional magnetic contact switches, these switches are completely hidden. The Long Round Magnetic Contact Switch is 1.3 inches long and is ideal for doors, and short round magnetic contacts ideal for windows are sold separately. Each contact has an operational gap of one inch.


What's Included

  • 1x - Hidden Mount Long Round Magnetic Contact Switch, Normally Closed
  • 1x - Owner's Manual
  • More Info

    Simply drill a 3/8 inch hole in the edge of a door or window jamb and press fit. The wires are passed through the jamb and framing and run over to the alarm system controller. Both the switch and wire are completely invisible when the door or window is closed. Mount the magnet in the door or window so that the two are in contact with each other when the door or window is closed.

    Other Features
    The contact switch is waterproof and enclosed in an epoxy compound that is moisture and corrosion resistant. The high-impact plastic case withstands hammering in of the switch and magnet. Comes with 15 inches of 22AWG wires and handles up to 1 Amps at 10 volts DC. It can reliably operate in temperatures between -15°F and 160°F. Rated for 50 million openings and closings, this thing will never wear out!

    Contacts are closed when magnet and sensor are together.



    Manufacturer Product No.:SM-207WH 3/8" C/L SW
    Compatibility:Use on closed circuit systems
    Rating:Up to 1 Amp at 10V DC
    Operating Temperature Range: -15°F to 160°F
    Length:1.3 inches
    Approval:UL listed

    Important notes:
    Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.
    Manufacturer contact information: SECO-LARM USA Inc, Tel: (949) 261-2999


    Installation Diagram  Installation Examples  Compact Size   
    Installation Diagram  Installation Examples  Compact Size   


    77 Ratings
    5 star: 69%  (53)
    4 star: 22%  (17)
    3 star: 4%  (3)
    2 star: 1%  (1)
    1 star: 4%  (3)
    Average Customer Rating
    (77 customer ratings)
    Share your thoughts with other customers
    KEN -- las vegas, NV   9/2/2013
    juse exactly what i was looking for and worked great
    KELLY -- live oak, TX   7/20/2013
    The product came in good time and good shape.
    Tom -- Northern NJ   12/9/2012
    Fantastic. Used them with closet light controller CLC212-NC, worked perfectly.
    STEVE -- piedmont, AL   12/3/2012
    Nice item. Fast Shipper
    JAROSLAW -- east hampton, CT   4/9/2012
    VINCENT -- fairfield, CA   1/6/2012
    Wasn't clear to me what "normally Closed" means - I think this should be explained on the item description. Probably works, tho. Normally closed means that when the magnet is next to the contact, it is closed. Depending on your installation, that may or may not mean "normal".
    DENNIS -- marietta, GA   12/17/2011
    Received item as advertised and within forecasted timeframe. Good price but expensive shipping on small parts. Easy installation. A good source for alarm system parts.
    LARRY -- concord, NC   10/31/2011
    Item has proved to be reliable over 23 years in service. Ordered these as replacements/additions for remodel. Price and shipping were great from Smarthome. Well pleased with service.
    RANDY -- humble, TX   6/27/2011
    Fast shipping
    DUSTIN -- senoia, GA   6/18/2011
    Worked great. Had to replace a few contacts. I used the long ones on the doors.
    GEORGE -- newark, DE   3/24/2011
    Dear Sirs, The problem is the sensor opens over night when the temperature goes down causing the door indicator led to come on. It closes again when it warms up outside. I have an extra uninstalled magnet I used to verify the contacts will open and close. I assume it is the magnet in the door. Thanks, George
    big jake -- bismark.nd   1/30/2011
    I use the neg ground on the reed switch for turning on and off my devices .. when the device is on, the magnet is out of range of the reed switch contacts... when the device is off, the magentic is in range of the reed switch contacts.. To me a Normal Close circuit is when the magnet is in range,the circuit is open.....and when the magnet is not in range, the circuit is closed ....when the neg.circuit is closed, the device is operating, when the neg. circuit is open, then device is not operating....
    WALTER -- wauseon, OH   11/9/2010
    easy to install, works great.
    ROBERT C. -- jacksonville, FL   9/9/2010
    "Normally closed" in this case means the switch is closed when the magnet is near by. I needed a switch that was closed when the magnet wasn't near it. But otherwise a fine product.
    DENNIS -- davie, FL   8/23/2010
    Great product, works just as advertised.
    ROBERT -- massillon, OH   7/31/2010
    These switches were easy to install and work well.
    GARY -- quinton, VA   7/26/2010
    Very please with order, shipped quickly and great price as well.
    JOSEF -- navarre, FL   4/25/2010
    Just what I needed to install in the new doors in my house!
    MATTHEW -- oviedo, FL   1/8/2010
    Easy and fast install. Does not include wire crimps though.
    DAVID -- sedalia, MO   10/10/2009
    Easy installation. great product for the money

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