1. Introduction
This manual provides comprehensive instructions for the E-ACE 4G Dashcam B73, a dual-channel car DVR designed to enhance driving safety and vehicle surveillance. It covers installation, operation, maintenance, and troubleshooting to ensure optimal performance.
2. Safety Information
- Before using this product, please review all precautions and operating instructions to ensure correct and safe usage.
- Do not adjust this product while driving; prioritize driving safety.
- Use only the included power cable provided in the product packaging. Other cables may cause fire, short-circuiting, or electric shock due to potential defects.
- Do not open the product casing or attempt repairs yourself. If the product malfunctions, please contact official customer support for assistance.
3. Package Contents
- Main Unit × 1
- User Manual × 1 (Refer to the PDF for full details)
- Power Cable × 1
- Electrostatic Stickers x 2
- Card Reader (Gift)
- Rear Camera (Optional)
- 6 Meters Rearview Camera cable (Optional)
- 24-hour parking cable (Optional)
- SIM Card (Optional)
4. Product Overview
The E-ACE B73 Dashcam is a compact device featuring a front-facing 2K Quad HD camera and an optional 1080P rear camera. It integrates GPS for tracking, 4G connectivity for remote live view, and various safety features.
Dashcam Components
Image: Front, side, and angled views of the E-ACE B73 Dashcam, showing its compact design and dimensions (6.5cm height, 9cm width).
Indicator Light Description
| LED Indicator Status | Status Declaration |
|---|---|
| Blue light blinking slowly, red light off | Normal working and video mode |
| Red light keeps on, blue light goes off | Network abnormal, recording abnormal |
| Red light blinking slowly, blue light off | Network abnormal, recording normal |
| Red light blinking fast, blue light off | Network normal, but recording abnormal |
| Red and blue light alternating slow blinking | Factory data reset |
| Red and blue light alternating fast flashes | Software upgrade |
5. Setup
SIM Card Installation
The dashcam supports 4G LTE connectivity. Ensure your SIM card supports the following frequency bands:
- Europe/Africa/Oceania/South/South America/Asia: FDD:(B1/B3/B5/B8)
- America: FDD:(B34/B38/B39/B40/B41)
Refer to the SIM card country table to ensure compatibility.
Image: Table showing SIM card compatibility by region (EU, SA, IL, KR) and corresponding countries.
Insert the 4G SIM card into the designated slot on the dashcam (if included or purchased separately).
TF Card Installation
Insert the storage card into the TF card slot (pay attention to the orientation). The pop-up TF card slot supports a maximum of 128GB/Class 10. Avoid inserting or removing the TF card while the device is in use.
Dashcam Mounting
Attach the bracket to the windshield in front of the rearview mirror using 3M adhesive (ensure correct direction and position; once applied, the adhesive is very difficult to remove).
Optimal Installation Area: The fuse box is typically located on the left side of the driver's seat or near the steering wheel.
Power Connection (Buck Line Wiring)
Use the Buck Line to not occupy the cigarette lighter interface. You will need to find two fuse slots to be used in this step.
- Connect the red wire (ACC) to a fuse slot that only provides power when you turn your key to the ACC position.
- Connect the yellow wire (VCC) to a fuse slot that provides constant power (this power source is always on and is not controlled by ignition).
- Connect the black wire (GND) to the ground terminal in the car's fuse box or a grounding screw/bolt.
Route the power cable along the front windshield, A-pillar, and passenger-side storage compartment, guiding it to the fuse box.
Image: Detailed wiring diagram showing connections for GND (Negative), ACC (Positive), and BAT&ACC (+) to the car's fuse box, with an internal chip diagram.
When the car starts, the recorder will automatically power on and emit a startup sound, indicating it has entered normal operating mode.
Rear Camera Installation (Optional)
Please connect the rear camera's Red cable wire with your car reverse lamp power's Positive pole(+). Then plug the car charger into the cigar lighter to power supply the car dvr. When you get your car in Reverse Gear, the car dvr will automatically switch to the rear camera with parking line. Then the auto reversing function will work.
If you don't need this function, please ignore the red wire, don't need to connect anything.
Image: Diagram illustrating the connection of the rear camera's red wire to the positive pole of the reversing light, and the routing of the rearview camera cable.
6. Operating Instructions
Connecting the Phone to the Recorder (HotKam App)
The recorder includes a built-in mobile network module and IoT card, enabling the phone to access live remote streaming and the 'One-Click Car Finder' function through the mobile network.
Scan the QR code to download the app or search for 'Xiaoying Guardian' (HotKam) in the app store. Register and log in to the app to operate and configure the device from your phone.
For iOS/Android devices: In the app's settings interface, add the device by tapping the scan icon in the upper-right corner. Then, scan the QR code on the device and follow the on-screen instructions to complete device pairing.
Detailed Setup Steps:
- Open the "Xiaoying Guardian" (HotKam) app.
- Tap the scan icon in the upper-right corner.
- Scan the QR code on the device.
- Tap "Next."
- The app will begin pairing with the recorder.
- Click "Start Experience" to complete the setup.
Installation Position Calibration
Upon first use, after entering the live preview interface, the app will automatically display the installation calibration pop-up.
Click the 'Go to Calibration' button to access the calibration interface. Then, click 'Installation Guide' and follow the prompts to adjust the lens angle so the vehicle's centerline aligns with the vertical reference line. Once adjusted, click 'Calibration Complete.'
Live Preview, Video Playback, Download & Share
Live Preview:
Open the app and click 'Enter Device' to access the live preview interface, allowing you to view the road environment in front of the vehicle.
Image: Mobile phone screen displaying live dashcam footage and a map with GPS tracking, showing current speed and mileage.
Video Playback:
To replay a video, drag the timeline at the bottom to the desired event, with options to adjust the playback speed (e.g., 0.5X, 1X, 1.5X, 2.0X).
Video Download & Share:
To capture a screenshot, tap the 'Capture' icon in the bottom-left corner. For first-time users, follow the prompt to allow the app to access 'All Photos.' Steps: Open Messages > click on the bottom-right Personal Center > System Permissions > Access Album to complete setup. Then, return to Messages to download or share captured images.
To start real-time recording, click the 'Record' icon in the bottom-right corner. To download or share captured images, go to Messages > select Video > choose the video to share and share your travel moments.
For emergency event downloads and playback, open the app and click 'Enter Device' to access the live preview interface. Then, click 'Emergency Events' at the top-right corner of the viewing window to see all collision videos, and select the needed video to download.
One-Click Car Finder / Messages
Activate the 'One-Click Car Finder' feature, which provides the vehicle's precise location and parking information through the app. Use real-time map navigation to locate the car.
When the vehicle experiences a collision while driving or parked, the device uploads the event's time, location, and images or videos of the collision. Users can view previous collision events in the Messages section.
Image: Mobile phone screen showing a map with a tracked vehicle's location and route, indicating GPS vehicle tracking functionality.
Parking Monitoring
Enters recording monitoring mode after parking and engine shutdown.
Intelligent AOV full-time low-power recording, with parking sleep mode, collision recording, and time-lapse recording. The extremely low power consumption allows for longer recording duration, even when powered by a storage battery.
Image: Illustration of a car parked with a blue glow indicating active 24-hour monitoring, highlighting AOV low-power recording and parking surveillance.
Collision Detection Alert
Gsensor Low-power rapid startup upon collision, with millisecond-level snapshot capture in emergency situations to preserve crucial evidence.
Image: A car accident scene, demonstrating the dashcam's collision detection alert feature.
Cloud Storage
Security-grade data safety, supporting real-time video upload, remote viewing, and privacy protection.
Customers can access the cloud storage marketplace to 'Activate Cloud Service.' This ensures that in the event of an emergency, any offline or damaged device will not affect the storage of primary data. Customers can download and replay emergency videos from the cloud.
Note: Without cloud storage activation, emergency event videos are only stored for one day.
Image: Dashcam connected to cloud icons, illustrating security-grade cloud storage for real-time video upload and remote viewing.
7. Settings
Open the app, connect to the recorder, and click [Settings] to adjust various recorder parameters.
TF Card Settings
- Audio Recording: During video recording, customers can choose to enable or disable audio recording according to their needs (Note: if audio recording is disabled, all recorded videos will be in mute mode). The default factory setting is 'Enabled.'
- TF Card Formatting: Customers can format the TF card independently.
Recorder Settings (Basic & Advanced)
Basic Settings:
Basic settings include: recorder name, volume adjustment, audio recording during video capture, video association for photos, image quality, advanced settings, and recorder storage management.
Advanced Settings:
| Setting | Description |
|---|---|
| H.264 Video Encoding | Enables H.264 encoding for video recording. |
| Timestamp Watermark | Toggle On/Off: Displays timestamp watermark on video. |
| Startup Sound | Toggle On/Off: Enables or disables the startup sound. |
| Collision Detection Sensitivity | High, Medium, Low, or Off. When set to low sensitivity, minor impacts will not trigger collision detection. This feature is related to parking monitoring; if collision detection is off, the recorder will not wake in parking mode. Enabling collision wake-up provides millisecond-level response and emergency event notifications. |
| Parking Monitoring Setting | Set the duration of parking monitoring recording. |
| Battery Protection | Supports 12V-18V wide voltage input with low voltage protection. Switches to G-sensor collision recording below 11.5V and shuts down the recorder below 11.23V to prevent battery drain. |
| Disable Parking Monitoring | When ACC is off, the device enters shutdown mode (no recording or wake-up possible during this period). |
| Parking Collision Mode | When ACC is off, the device enters sleep mode (no recording during this period; recording resumes when a collision is detected or the device is awakened via the app). |
| Smart Mode | After ACC is off, the recorder continues recording if vehicle voltage is above 11.5V. It enters sleep mode if voltage is between 11.5V and 11.23V, and shuts down below 11.23V due to low battery. |
Firmware Upgrade
Open the 'Xiaoying Guardian' app, then select [Device Settings] > [About Device] > [Firmware] to view [Latest Firmware Version]. The app will display the current and latest firmware versions. If a new version is available for the app or the recorder firmware, follow the in-app prompts to complete the upgrade.
Device Sharing
Click on 'Device Sharing' to access the QR code sharing interface. Customers can share the device with friends or family by using the 'Scan to Add' feature face-to-face or forwarding the QR code through WeChat.
8. Specifications
| Feature | Specification |
|---|---|
| Brand Name | E-ACE |
| Model | B73 |
| Item Type | Car DVR |
| Assembly Mode | Portable Recorder |
| Chipset Manufacturer | HISILICON |
| Imaging Sensor | Sony IMX335 |
| Pixels | 500Mega |
| Number Of Lenses | 2 |
| Aperture | F1.8 |
| View angle | 165° (Front), 145° (Rear) |
| Camera Resolution | Front: 2560x1440P@30FPS; Rear: 1920x1080P@25FPS |
| Maximum Video Frame Rate | 30fps |
| Video Code | H.264 |
| Audio Format | G711 16K |
| Photo Format | JPEG |
| Built-in Screen | No (View via App) |
| Touch Screen | No |
| Screen Ratio | NONE |
| Input/Output | Type-C |
| Interface | AV-In, Micro SD/TF |
| Max External Memory | 256G (Up to 256GB) |
| Memory Card Required Reading Speed | Class 10 |
| Power Source | Corded Electric (DC12V/1A Fuse Box Power) |
| Operating Voltage | 12V/1A |
| Operating Temperature Range | -10℃~65℃ |
| Battery | Built-In (5mAh) |
| Is Batteries Included | Yes |
| GPS logger | External (Built-in GPS Tracking) |
| APP Compatibility | HotKam (Xiaoying Guardian) |
| NightShot Function | Yes |
| Rear Camera | Yes (Optional) |
| Original Package | Yes |
| Special Features | G-Sensor, SD/MMC Card, Built-in GPS, Radar Detector, Anti Surge Voltage Impact, Waterproof, Anti Fog, Anti Vibration, Real Time Surveillance, Automatic White Balance, Wide Dynamic Range, Parking Monitor, Speed and Coordinates Recording, 3D DNR, Collision Detection, Cloud Storage, LTE Cloud Monitoring, Motion detection, Sentry Mode, Time-lapse video |
| Certification | CE, FCC, RoHS |
| Origin | Mainland China |
9. Troubleshooting
Common Problems and Solutions
1. QR Code on the Device Body is Damaged and Unable to Connect?
Use a pin to press the RESET hole on the recorder for approximately 5 seconds. This will restore the recorder to factory settings. You can then re-scan the QR code on the device to add it.
2. The device is offline
- Check the status of the device indicator. If the network is well connected, the blue light will blink slowly.
- Check whether the network is connected when the device is powered on.
- Check whether the network is sound.
- Check whether the device is activated.
- Confirm what mode is set. Collision mode indicates that the device is set normally.
- Reset it and have a try.
- Confirm whether it is the latest software version, if not, please upgrade it.
3. GPS cannot locate
- The locating time is less than 3 minutes. It is difficult to locate it in the case of interference in some areas.
- If the car is parked in the underground garage and the high floor with metal places, GPS cannot locate it.
- Check whether it is the latest software version, if not, please upgrade it.
- You can try to put the device on the roof of the car to see if you can locate it.
- If it is not located for a long time, you can format the TF card or reset the device.
10. User Tips
- Charging Cable: Always use the standard charging cable provided to ensure proper startup and operation of the device.
- SIM Card Compatibility: Before purchasing a SIM card, verify that it supports the specific frequency bands required for your region (FDD:(B1/B3/B5/B8) for Europe/Africa/Oceania/South/South America/Asia, and FDD:(B34/B38/B39/B40/B41) for America). Incorrect SIM card bands will prevent network connectivity.
- TF Card: Use a Class 10 high-speed TF card, up to 128GB, for reliable recording. Avoid inserting or removing the card while the device is active to prevent data corruption.
- App Connection: If the QR code is damaged, perform a factory reset by pressing the RESET hole for 5 seconds to re-pair with the app.
- Cloud Service: Consider activating the cloud service for emergency video backup, especially since local emergency videos are only stored for one day without it.
11. Warranty & Support
The E-ACE 4G Dashcam B73 comes with a 365-day warranty.
For detailed warranty terms and conditions, please refer to the full user manual available as a PDF.
For further assistance or technical support, please contact E-ACE customer service.
A comprehensive user manual is available in PDF format: Download User Manual (PDF)
