Wireless Window/Door Contact Slimline

Average rating:

(based upon one review)

The DSC EV-DW4975 is a wireless door and window contact that features a slimline design. It is a surface-mount contact that features a slim profile to make it nearly invisible after it has been installed. The device operates at the 433 MHz frequency. Buy the EV-DW4975 from Alarm Grid.
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The DSC EV-DW4975 Vanishing Door and Window Contact allows for the discreet monitoring of a door or window. It is a surface-mount contact, and its slim profile makes it nearly invisible once it has been installed. This makes it an excellent option for when aesthetics are a concern.

The device measures in at 2.25"L X 1"W X 15/64"D. At less than a quarter of an inch thick, this is one of the thinnest door and window sensors we have ever seen. It is nearly invisible once installed on a white door frame. The sensor can be mounted using its included doubled-sided foam tape, allowing for a very easy installation. Its 433 MHz wireless frequency allows it to be used with the DSC Impassa and the DSC PowerSeries Alarm Systems.

When installing the EV-DW4975, the sensor should be placed on the door or window frame, and the included magnet should be placed on the door or window itself. For optimal performance, the magnet should be placed within 5/8 inch of the sensor. When the door or window is opened, the magnet will separate from the sensor. The sensor will recognize this, and it will send an alert to the alarm system when this occurs.

The device operates using a 3-volt lithium CR2032 coin battery that has an average life-span of 5 to 8 years. When the battery is low, the device will transmit a low-battery warning to the alarm system. The battery can then be easily replaced by the end user.


  • Sensor Type: Surface-Mounted Contact
  • Operating Frequency: 433 MHz
  • Communication: Non-Encrypted Wireless
  • Sensor Dimensions: 2 1/4"L X 1"W X .15/64"D (57 mm x 25.4 mm x 5.9 mm)
  • Maximum Magnet Spacing Gap: 5/8˝ (16 mm)
  • Mounting Methods: Screws or Adhesive Foam Tape
  • Hardwired Input: No
  • Battery Type: One (1) Panasonic CR2032 Coin-Cell Battery
  • Expected Battery Life: Five (5) to eight (8) Years
  • Manufacturer: DSC

Brand: DSC

DSC EV-DW4975 Compatible Products

Surface-Mount Magnet 1"L x 0.25"W x 0.25"D
List Price: $3.00
Our Price: $3.99
Good 433 MHz Sensor
Submitted on 09/16/2020 Alarm Grid

The DSC EV-DW4975 is a wireless slimline 433 MHz door and window contact sensor for use with system such as the DSC Impassa, the DSC PowerSeries (added receiver required), and the 433 MHz Qolsys IQ Panel 2 Plus. If you're in need of a 433 MHz door and window sensor, then this is a great option to choose from. It has a slim profile, and it is relatively straightforward and easy to use. Although it isn't the fanciest sensor, it doesn't offer many downsides, and it still performs quite well to this do. For those reasons, we give the DSC EV-DW4975 a perfect 5-Star rating.

There are many positive aspects to like about the DSC EV-DW4975. For one, it has an extremely slim profile. In fact, the sensor measures less than a quarter-inch thick. The complete dimensions for the sensor are 2.25"L X 1"W X 15/64"D. The sensor is a bit on the lengthy side, but its width is average, and it is indeed super thin. The sensor also offers a fantastic battery life, as it can go roughly five (5) to eight (8) years without a replacement, assuming typical usage. If you need to replace the battery for the sensor, then you will want to get a lithium CR2032 coin battery. You can find these at most pharmacies, or you can purchase one from Alarm Grid.

There are not many downsides regarding the DSC EV-DW4975. Its magnet spacing gap is just 5/8 of an inch. This is about average for a sensor of this caliber, but you should be able to find sensors with a larger magnet spacing gap if you look hard enough. The 433 MHz frequency isn't commonly used with security systems anymore. Most users starting from scratch will not elect to build around this frequency. Instead, you will typically only use this frequency if you are upgrading an old Impassa or PowerSeries System, or if you have a 433 MHz IQ Panel 2 Plus for some reason. It's also worth mentioning that this sensor does not utilize any wireless encryption for enhanced wireless security. But these downsides aside, we still give the DSC EV-DW4975 a 5-Star rating.

Good: Slim Sensor, Great Battery Life

Bad: Average Magnet Spacing Gap, 433 MHz Isn't Commonly Used Anymore, No Encryption

Bottom Line: 5 Stars

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