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Ships within 48 hours · Estimated delivery Aug 23 - Aug 28
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Description
DEI 508D Invisibeam Field Disturbance SensorThe Directed 508D proximity sensor detects motion events using RF (radio frequency) field disturbance technology. It emits a radio wave and looks for any disturbances in the wave, which if detected can trigger a warn away signal or a full trigger of your car security system. The 508D is one of the most accurate motion sensors in the car security market, and is a great addition to any security system. The Directed 508D proximity sensor is perfect for
- The Directed 508D proximity sensor detects motion events using RF (radio frequency) field disturbance technology.
- It emits a radio wave and looks for any disturbances in the wave, which if detected can trigger a warn away signal or a full trigger of your car security system.
- The 508D is one of the most accurate motion sensors in the car security market, and is a great addition to any security system.
- The Directed 508D proximity sensor is perfect for use in convertibles so you can arm your car with the roof down and rest assured that if someone reaches into the vehicle the security system will trigger.
- The 508D can also be used for standard roof vehicles, for times you wish to arm the vehicle with the windows down, if someone reaches in your alarm will trigger.
- This sensor features a dual sensitivity adjustment feature, where you can adjust the inner and outer fields (inner field is full trigger, outer field is warn away)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 5
All around helpful---worth the money!
Format: Paperback
This guide has been most helpful for all the folks I help prepare for the iTEP test! It gives insight into what each section of the test is looking for along with examples and great tips about actually TAKING the test. In the Writing and Speaking sections, it also gives sample scores and comments from the Master Grader which is very helpful too.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 9, 2019
★★★★★ 5
Comprehensive, clear and coherent!
Format: Paperback
The iTEP Practice Guide combines a no-nonsense approach to the specific iTEP tests and at the same time offers exercises that task the student with what they need to know. Exercises not only serve the purpose of scoring well, but the overall approach is communicative competence. We use the text in our group and one-to-one classes with very positive--and lasting--results.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 23, 2019
★★★★★ 1
No recomiendo
Format: Paperback
Muy malo, no vine completo, además se demoró mucho más de lo que decía al momento de comprarlo. Solo aplazaban la fecha de entrega sin consultar cómo afectaba al cliente. Yo tuve que presentar el examen sin el libro, porque no llegó en la fecha que decía al comprarlo y después se cambió 3 veces la fecha, casi cumpliendo el mes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 30, 2025
★★★★★ 5
VERY EFFICIENT MATERIAL
Format: Paperback
It's the most efficient material to prepare the test.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 1, 2020
★★★★★ 5
All around helpful---worth the money!
Format: Paperback
This guide has been most helpful for all the folks I help prepare for the iTEP test! It gives insight into what each section of the test is looking for along with examples and great tips about actually TAKING the test. In the Writing and Speaking sections, it also gives sample scores and comments from the Master Grader which is very helpful too.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 9, 2019
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