--- product_id: 465781265 title: "BY-J Blind Spot Monitoring System, 24GHz Millimeter Wave Radar Universal Car Blind Spot Detection System, Reversing Radar Parking System" brand: "by-j" price: "¥34839" currency: JPY in_stock: true reviews_count: 8 url: https://www.desertcart.jp/products/465781265-by-j-blind-spot-monitoring-system-24ghz-millimeter-wave-radar store_origin: JP region: Japan --- # 24GHz millimeter wave radar precision LED + buzzer instant hazard alerts 3.5m×15m blind spot coverage range BY-J Blind Spot Monitoring System, 24GHz Millimeter Wave Radar Universal Car Blind Spot Detection System, Reversing Radar Parking System **Brand:** by-j **Price:** ¥34839 **Availability:** ✅ In Stock ## Summary > 🚦 Drive Confidently, Stay Ahead of Danger! ## Quick Answers - **What is this?** BY-J Blind Spot Monitoring System, 24GHz Millimeter Wave Radar Universal Car Blind Spot Detection System, Reversing Radar Parking System by by-j - **How much does it cost?** ¥34839 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/465781265-by-j-blind-spot-monitoring-system-24ghz-millimeter-wave-radar) ## Best For - by-j enthusiasts ## Why This Product - Trusted by-j brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Seamless Auto Operation:** Starts with your engine and shuts off automatically—zero hassle, maximum safety. - • **Smart Lane Change Assist:** Visual and auditory warnings activate with your turn signal to prevent risky lane changes and collisions. - • **Door Opening Safety Alert:** Prevents accidents by alerting you when approaching objects threaten sudden door openings. - • **Universal Fit for DC12V Vehicles:** Compatible with most sedans, SUVs, MPVs, and pickups (plastic bumpers only) for broad usability. - • **Radar-Accurate Blind Spot Detection:** Dual 24GHz sensors scan your rear blind spots in real-time, ensuring no vehicle goes unnoticed. ## Overview The BY-J Blind Spot Monitoring System uses advanced 24GHz millimeter wave radar sensors to monitor your vehicle’s rear blind spots within a 3.5m by 15m range. Featuring LED indicators and buzzer alerts, it provides real-time warnings for lane changes, door openings, and reversing hazards. Designed for DC12V vehicles with plastic bumpers, it automatically activates with your engine, enhancing driving safety and reducing collision risks. ## Description The rearview mirrors on both sides of the car can only see both sides of the car body, and cannot fully collect all the information around the car body, especially from the main road on the auxiliary road. The left rearview mirror cannot observe the vehicle. If you accelerate and cut into the inner lane at a large angle , Easy to collide with a vehicle driving at a high speed in the inner lane. Blind spot information systems are increasingly a "must-have" feature for large trucks and SUVs with long tail ends and poor rear visibility. WARNING: Do not use the blind spot information system as a replacement for using the interior and exterior mirrors or looking over your shoulder before changing lanes. The blind spot information system is not a replacement for careful driving. WARNING: The system may not operate properly during severe weather conditions, for example snow, ice, heavy rain and spray. Always drive with due care and attention. Failure to take care may result in a crash. NOTE: The system does not prevent contact with other vehicles. It is not designed to detect parked vehicles, pedestrians, animals or other infrastructures. NOTE: The system may not alert you if a vehicle quickly passes through the detection zone. IMPORTANT: Can install on cars with a plastic bumper only, not work with vehicles with a metal bumper as metal bumper will interference with the radar sensor. This item fits for most DC12v sedan, compact, SUV, MPVs, pickup etc and professional audio installer installation is required. ## Features - Product Description: Blind Spot Detection is a driver assistance system for safe lane changes and collision avoidance; Built with two 24GHz radar sensors, it monitors the vehicle’s left and right rear blind spots within 3.5m×15m, detecting moving objects with a speed difference over 0.5m/s; LED indicators and a buzzer give instant warning alerts once hazards are spotted - Function Protection 1: BSD Blind Spot Detection – Real-time monitoring of the left and right rear blind spots; LEDs will illuminate continuously for 3s to warn of approaching vehicles - Function Protection 2: LCA Lane Change Assist– When a vehicle approaches and the turn signal is activated, visual and auditory warnings are triggered to prevent reckless lane changes and collisions. - Function Protection 3: DOW Door Opening Warning – This alarm sounds when a moving object approaches the vehicle, preventing accidents caused by sudden door opening - Operating Mode: Automatically starts when the engine starts and automatically shuts off when the engine stops; It does not react to stationary objects, only warning moving objects such as cars, pedestrians, bicycles, and motorcycles, reducing unnecessary alarms - Important Notes: Fits DC12V vehicles cars, SUVs, MPVs, commercial vehicles, pickups up to 4.7m, Exceeds length, Contact seller to buy extension cable; Only fits plastic bumpers, not metal ones; English manual & wiring diagram included, other languages on request - Customer Service: If you encounter any problems during installation, please do contact us. Our professional engineering team is available anytime via WhatsApp. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B09VDLDZT8 | | Best Sellers Rank | #106 in Radar Detectors | | Brand | BY-J | | Compatible Devices | Most DC12v sedans, compact cars, SUVs, MPVs, and pickups without metal bumpers | | Customer Reviews | 4.2 4.2 out of 5 stars (15) 4.2 out of 5 stars | | Display Type | LED | | Frequency Bands Supported | 24 GHz | | Item Dimensions L X W X H | 15"L x 11"W x 3"H | | Manufacturer | BY-J | | Mfr Part Number | 24GHz 063-24 GHz | | Model Number | 24GHz 063-NEW | | Number Of Items | 1 | | Power Source | Corded Electric | | Upc | 739722614508 | | Voltage | 12 volts | | Warranty Description | 1 year | ## Product Details - **Brand:** BY-J - **Compatible Devices:** Most DC12v sedans, compact cars, SUVs, MPVs, and pickups without metal bumpers - **Display Type:** LED - **Frequency Bands Supported:** 24 GHz - **Number of Items:** 1 - **Power Source:** Corded Electric - **Product Dimensions:** 15"L x 11"W x 3"H - **UPC:** 739722614508 - **Voltage:** 12 volts ## Images ![BY-J Blind Spot Monitoring System, 24GHz Millimeter Wave Radar Universal Car Blind Spot Detection System, Reversing Radar Parking System - Image 1](https://m.media-amazon.com/images/I/61k28AA7s6L.jpg) ![BY-J Blind Spot Monitoring System, 24GHz Millimeter Wave Radar Universal Car Blind Spot Detection System, Reversing Radar Parking System - Image 2](https://m.media-amazon.com/images/I/71qbyBEkOlL.jpg) ![BY-J Blind Spot Monitoring System, 24GHz Millimeter Wave Radar Universal Car Blind Spot Detection System, Reversing Radar Parking System - Image 3](https://m.media-amazon.com/images/I/61J0hedp8HL.jpg) ![BY-J Blind Spot Monitoring System, 24GHz Millimeter Wave Radar Universal Car Blind Spot Detection System, Reversing Radar Parking System - Image 4](https://m.media-amazon.com/images/I/718OMaLPq4L.jpg) ![BY-J Blind Spot Monitoring System, 24GHz Millimeter Wave Radar Universal Car Blind Spot Detection System, Reversing Radar Parking System - Image 5](https://m.media-amazon.com/images/I/81a8nVozrCL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: Can i install this on 2014 camry se sedan?** A: yes, it works on 2014 camry se sedan. **Q: Does the system shut off automatically at a certain speed and at lights?** A: No, it won't, you need to close it yourself when you don't need it. **Q: Speed control box? I followed the instructions and wiring diagram, but it shows I am missing the speed control box, where do I purchased the box?** A: my doesn't have control box ,not really need it, still working good **Q: Can I install this item on the Honda Civic coupe 2019？** A: It can be installed on the Honda Civic coupe 2019, but please notes this product cannot function through metal bumpers. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Instalación rápida, cumple con buen desempeño *by on Reviewed in the United States September 6, 2026* Lo ofertado es lo recibido ### ⭐⭐⭐⭐⭐ Love it *by on Reviewed in the United States December 29, 2025* Works as intended have bought 3 kits and all work fine on all our vehicles and help out with safety easy to install and good quality ### ⭐⭐⭐⭐⭐ Buena relación precio y cantidad *by on Reviewed in the United States January 18, 2026* Es lo que esperaba ## Frequently Bought Together - BY-J Blind Spot Monitoring System, 24GHz Millimeter Wave Radar Universal Car Blind Spot Detection System, Reversing Radar Parking System - Xislet 16.5" Radar Detector Hardwire Power Cord Mirror Wire Plug Tap Compatible with Escort Valentine One Uniden Beltronics with Inline Fuse Mount RJ11 - Set of 3 - Hydencamm 14" Upgraded Mirror Plug Wire Tap Radar Detector Hardwire Power Cord Kit for Escort Valentine One Uniden Beltronics, Mount RJ11 with Braided Set of 3 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/465781265-by-j-blind-spot-monitoring-system-24ghz-millimeter-wave-radar](https://www.desertcart.jp/products/465781265-by-j-blind-spot-monitoring-system-24ghz-millimeter-wave-radar) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-20*