1. المقدمة
The RYSJM G21 is a versatile GPS Head-Up Display (HUD) designed to enhance driving safety by projecting essential vehicle data directly into the driver's line of sight. This digital speedometer is compatible with all types of vehicles, including new energy vehicles, gas-electric hybrid vehicles, fuel cars, buses, and trucks, thanks to its built-in GPS + BEIDOU dual-mode chip.
Key features include real-time speed display (MPH/KMH), time, number of satellites, compass, single driving distance and time, total mileage, altitude, and a 0-100km/h acceleration test. It also incorporates safety features such as overspeed alarms and fatigue driving reminders. The device boasts a plug-and-play design for easy installation and automatic brightness adjustment for optimal visibility in varying light conditions.
Video: Demonstrating the RYSJM G21 HUD in action, showcasing various display modes and real-time data.
2. محتويات العبوة
يرجى التأكد من تضمين جميع العناصر التالية في الحزمة الخاصة بك:
- G21 HUD Unit
- Rotary Suction Cup Holder
- Type-C Interface Cable
- سجادة غير قابلة للانزلاق
- دليل التعليمات

Image: Contents of the RYSJM G21 HUD package.
3. انتهى المنتجview and Display Functions
The G21 HUD features a clear HD LED display and intuitive controls. Below is a detailed breakdown of its components and display capabilities.
3.1 مكونات الجهاز

Image: G21 HUD dimensions and component labels.
- Multi-function Dial Keys: يتم استخدامه للتنقل بين القوائم وضبط الإعدادات.
- 360° Rotating Bracket: يسمح بتحديد المواقع المرنة و viewزوايا متعددة.
- High-speed Type-C Interface: لتوصيل الطاقة.
- الاستشعار التلقائي: Detects ambient light for automatic brightness adjustment.
3.2 Display Functions Explained

Image: Detailed breakdown of the G21 HUD display elements.
- Speed Display Area: Shows current vehicle speed in MPH or KM/H.
- منطقة عرض متعددة الوظائف: Can show Altitude, Distance Traveled, Travel Time, or Current Time.
- رمز القمر الصناعي: Indicates GPS signal status.
- Fatigued Driving Icons: Visual reminder for long driving periods.
- Speed Alarm Icon: Alerts when overspeed limit is reached.
- بوصلة: Displays driving direction (N, S, E, W).
- الوحدات: Supports both Kilometers (KM) and Miles (MPH) for speed and distance.
- الإضاءة المحيطة: Decorative and functional lighting.
- ODO (Total Mileage): Tracks cumulative distance traveled.
- Acceleration Time (a+): Measures 0-100km/h acceleration.
3.3 Multiple Display Modes
The G21 offers various display modes to suit your preferences and driving needs:

الصورة: السابقamples of multiple display modes available on the G21 HUD.
- السرعة فقط
- Time Only
- Speed + Travel Time
- Speed + Distance Traveled + Ambient Lighting
- Speed + Total Mileage + Compass + Ambient Lighting
- Speed + Altitude + Compass + Ambient Lighting
4. الإعداد والتثبيت
The RYSJM G21 HUD is designed for easy plug-and-play installation. Follow these steps to set up your device:
4.1 توصيل الطاقة
- Insert the provided Type-C power cord into the G21 HUD unit.
- Connect the other end of the power cord to a car USB interface (5V power supply).
- Upon power-on, the satellite icon on the display will flash. This indicates the device is searching for a satellite signal.
- Wait for the display to show '00' (or a stable speed reading) and the satellite icon to stop flashing. This confirms a successful satellite connection and normal operation.
مهم: حجم العملtage of this product is 5V. Do not use a power supply with a voltage higher than 5V or modify the installation wiring, as this may damage the device.

Image: Connecting the G21 HUD to the car's USB power source.
4.2 خيارات التركيب
The G21 HUD can be installed in two primary ways using the included rotary suction cup holder and non-slip mat:
- Dashboard Placement (Non-slip Mat): Place the non-slip mat on your dashboard and position the HUD unit on top. Ensure it does not obstruct your view.
- A-Pillar/Windshield Mounting (Suction Cup Holder): Attach the suction cup holder to the back of the HUD unit. Secure the suction cup to a clean, smooth surface on your A-pillar or windshield, ensuring a clear line of sight and stable mounting. The 360° rotating bracket allows for precise angle adjustment.

Image: Illustrating the 360-degree rotation of the suction cup holder.

Image: G21 HUD placed on the dashboard, demonstrating its small footprint.
5. تعليمات التشغيل
5.1 Automatic Power On/Off
The G21 HUD is designed to automatically power on when your car starts and power off when the car shuts down, ensuring convenient operation without manual intervention.

Image: Automatic power on/off functionality.
5.2 تبديل أوضاع العرض
Use the multi-function dial keys (located on the back of the unit) to cycle through the various display modes and select the information you wish to view. Refer to section 3.3 for a list of available modes.
5.3 Setting Alarms and Units
The G21 allows you to set overspeed alarms and fatigue driving reminders. You can also switch between Kilometers (KM) and Miles (MPH) for speed and distance units. Detailed instructions for these settings can be found in the full instruction manual (included in the package).

Image: Overspeed alarm and fatigue driving reminder icons.
5.4 ضبط السطوع تلقائيًا
The built-in light sensor automatically adjusts the display brightness based on the external environment, ensuring clear visibility during both day and night driving.

Image: Automatic brightness adjustment for day and night.
6. المواصفات
| ميزة | التفاصيل |
|---|---|
| العلامة التجارية | RYSJM |
| نموذج | جي21 |
| اسم الحجم | 3.5 بوصة |
| الاتصال | Wired (Type-C USB) |
| GPS Head-Up Display Type | عداد السرعة |
| Positioning Chip | GPS + BEIDOU dual-mode chip (10Hz high refresh rate) |
| العمل المجلدtage | 5V |
| طول الحزمة | 12 سم |
| عرض الحزمة | 9 سم |
| ارتفاع الحزمة | 8 سم |
| وزن الحزمة | 0.173 كجم |
| أصل | الصين القارية |
7. استكشاف الأخطاء وإصلاحها
- No Speed Display or Incorrect Speed:
This device is a GPS digital speedometer, and its speed data is collected from satellites. If you are testing the device indoors or in a parking lot with poor satellite reception, the speed may not be displayed correctly or at all. Please conduct tests outside the vehicle in an open area with a clear view من السماء لاستقبال إشارة GPS الأمثل.
- Satellite Icon Flashing Continuously:
A flashing satellite icon indicates that the device is searching for a satellite signal. Ensure the device has a clear view of the sky. Once a signal is acquired, the icon will stop flashing, and the display will show '00' (or a speed if moving), indicating it's ready for use.
- الجهاز لا يعمل:
Check the Type-C USB connection to ensure it is securely plugged into both the HUD unit and the car's USB port. Verify that the car's USB port is providing power. Remember, the device requires a 5V power supply. Using a voltage higher than 5V is prohibited and can damage the unit.
8 نصائح المستخدم
- For the most accurate speed readings, ensure the device is placed where it has an unobstructed view of the sky to receive strong GPS signals.
- Experiment with different mounting positions (dashboard or A-pillar) using the provided accessories to find the spot that offers the best visibility without obstructing your view من الطريق.
- Familiarize yourself with the multi-function dial keys to quickly switch between display modes and adjust settings like speed units (MPH/KMH) and alarm thresholds.
- خذ المبادرةtage of the overspeed alarm and fatigue driving reminder features to promote safer driving habits.
9. الضمان والدعم
For warranty information, technical support, or service inquiries, please refer to the contact details provided with your purchase documentation or visit the official RYSJM webالموقع. احتفظ بإثبات الشراء الخاص بك لاستخدامه في أي مطالبات بالضمان.





