Parking Monitoring Made Easy: How to Use the Lamtto DC21 Dash Cam Hardwire Kit

What is Parking Monitoring?

Parking monitoring means that when the car is turned off or parked, the dashcam automatically starts recording when it detects external collisions, violent shaking or other abnormal situations through the built-in gravity sensor (G-Sensor), effectively recording events such as collisions, scratches, damage or theft.

Detection Scenarios

Typical scenarios include being hit by a reversing car, strong winds shaking the car body, or window smashing and theft, those events can be recorded in real time to help ensure vehicle safety.

What is Hardwire Kit? 

The dashcam hardwiring kit typically includes three wires: the power wire (red), the ACC wire (yellow), and the ground wire (black). By connecting to the vehicle's fuse box, it steps down the 12V/24V in-car voltage to a stable 5V output, directly powering the dashcam. It features voltage step-down and regulation, low voltage protection, ACC smart detection, and supports functions such as parking monitoring and automatic mode switching. The kit has a hidden design, which does not occupy the cigarette lighter socket.

How the Hardwire Kit Changes Power Supply？

Taking the Lamtto DC21 1080p dash cam as an example: The vehicle's 12V voltage is transmitted through the ACC wire to the step-down module, which converts the voltage to a stable 5V to power the dashcam. This voltage change directly affects the dashcam's power consumption. For instance, with a 12V input and a current draw of 3A, using the formula P = U × I, the power would be 5V × 3A = 15W. Through the step-down module, the DC21 dashcam operates efficiently within a stable power range, ensuring long-term stable performance. This not only helps to save energy and reduce power wastage, but also extends the lifespan of the battery, preventing excessive discharge that could lead to battery depletion.

Why do we recommend using a multimeter to check the voltage？

When connecting the ACC hardwire kit, using a multimeter is the most reliable and recommended method. However, in some cases, you can also make an initial judgment based on the wire color or markings, but be cautious of the following points:

Wire color may vary across different vehicle models
Different models, years, and brands may use the same color wire to represent different functions, so relying solely on color for identification is not advisable.

A multimeter can clearly verify the voltage status
Use the multimeter to check whether the voltage is constant (always powered) or ACC (only powered when the ignition is on).

Avoid incorrect wiring that could cause fuse damage or dashcam malfunction

Additionally, you can assist the process by checking the fuse diagram or using a power tester.

How does the hardwire kit work?

How to identify “Constant Power” and “ACC” Fuse Positions? 

Functions and Benefits of a Hardwire Kit

1. Enables Driving and Parking Monitoring
   Automatically switches between driving and parking modes; supports collision detection recording for 24/7 vehicle surveillance.

2. Supports Low Voltage Protection
   Automatically cuts off power when the battery voltage drops below a preset level (e.g., 11.8V) to prevent battery drain and ensure the car can start.

3. Voltage Regulation to Protect the Device
   Steps down 12V/24V vehicle power to a stable 5V output, protecting internal components, reducing heat, and extending the device's lifespan.

4. High Power Conversion Efficiency
   Uses efficient switching technology with up to 80%–95% conversion efficiency, reducing energy loss and easing the battery load.

5. Clean Installation and Better Aesthetics
   No need to use the cigarette lighter socket; supports hidden installation for a tidier car interior.

6. Improved Stability and Safety
   Supports wide voltage input (e.g., 6V–36V) to handle fluctuations during startup or acceleration. Built-in fuse and EMI filter reduce interference and prevent device damage.