Leaprock

Premium Bluetooth LED Message Sign User Manual

For SKUs below: INT21A

Preface

Thank you for choosing Leaprock

As an innovative brand with a decade of dedicated expertise in automotive electronics, Leaprock upholds the core philosophy of "Different . Better . Trusted" . We seamlessly integrate professional audio-visual technology and user-friendly interactive features to elevate every journey with refreshing experiences.

Copyright Statement

The copyright and related intellectual property rights of these manuals (including electronic and printed versions) are exclusively owned by Leaprock. Without explicit written authorization from Leaprock, no organization or individual may use the content in any form (including but not limited to copying, distributing, adapting, translating, mirroring, or reposting) for commercial purposes or provide it to third parties.

FCC Compliance Statement

The FCC Compliance Statement is an official declaration by Leaprock to users indicating that the product complies with the radio frequency interference and electromagnetic compatibility (EMC) regulations of the U.S. Federal Communications Commission (FCC). The specific statement is as follows:

This device strictly complies with all provisions of Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

1.This device must not cause harmful interference;

2.This device must accept any interference received, including interference that may cause undesired operation.

Contact Leaprock Customer Support

If you encounter any issues during installation or use, our support team is ready to assist.

Email: support@leaprock.com

Chapter 1 Important Information

1.1 About this Manual

This manual is designed to guide you through the basic installation process of Leaprock products and help you understand their core functions.

As shown below, along with Installation Tutorials and Operation Tutorials, you’ll also find FAQs, E-Warranty, Subscription, and App Downloads—all aimed at delivering a smoother and more enjoyable product experience.

1.2 Warnings

Vehicle Condition

For safety, install or connect the INT21A message sign only when the vehicle is parked and powered off. Do not install, connect, or adjust the device while driving or while the vehicle is in operation, as this may cause electrical hazards, improper installation, or safety risks.

Environmental Conditions

For best performance, perform Bluetooth pairing and initial setup in a dry, clean, and low-interference environment.

Avoid using or setting up the device in areas with high humidity, excessive dust, or strong electromagnetic interference, as these conditions may affect Bluetooth connection stability or device performance.

Operation Safety

Do not operate the app, adjust settings, or edit display content while driving. Doing so may distract the driver and increase the risk of an accident.

Keep the device and accessories out of reach of children to prevent misuse, accidental damage, or injury.

Avoid exposing the device to extreme heat, high humidity, or prolonged direct sunlight when not in use.

Make sure the device and power cable do not block the driver’s view, interfere with vehicle controls, affect airbag deployment areas, or obstruct mirrors, windows, or other safety-related components.

Connection Failure Handling

If the INT21A message sign is not recognized or fails to connect, follow the reconnection steps below:

1. Make sure the message sign is powered on.
2. Make sure the message sign is not already connected to another phone, head unit, or AI box.
3. Turn off Bluetooth on your phone, head unit, or AI box.
4. Turn Bluetooth back on.
5. Search for nearby devices again and reconnect to the message sign.

Note: Use SSHub on a smartphone, or CarIoTHub on a compatible car head unit or AI box.

If the issue persists, please contact customer support. Do not disassemble, repair, or modify the product yourself.

Power and USB Connection

The INT21A message sign has no built-in battery and must be powered by an external USB power source.

Use the supplied USB-A to USB-C power cable, or an equivalent qualified USB cable, to power the device. Make sure the cable is firmly connected before use.

Avoid routing or placing the device and cables in extremely hot, humid, or unsafe areas. Route the cable properly so it does not interfere with driving, pedals, seat movement, doors, or other vehicle controls.

Chapter 2 Product Overview

The INT21A is a 21-inch full-color Bluetooth LED interactive display designed for creative message display, in-car interaction, storefront promotion, and personal expression.

2.1 What’s in the Box

2.2 Important Notes Before Installation

Before installing the message sign, please read the following notes carefully:

1. Park the vehicle in a safe location and turn off the vehicle before installation.
2. Plan the power cable routing in advance. Keep the cable away from airbags, sharp edges, pedals, moving parts, and areas that may interfere with driving.
3. Select a secure mounting location where the screen will not block the driver’s view or interfere with driving operation, vehicle controls, mirrors, airbags, or window movement.
4. Clean the mounting surface, such as the windshield or dashboard area, before attaching the message sign. Make sure the surface is dry, dust-free, and free of oil or other residue for better adhesion.

2.3 installation procedure

Step 1: Clean the Mounting Area

Clean the area of the car window where you want to mount the screen. Make sure the surface is dry, dust-free, and free of oil or other residue to ensure better adhesion.

This also applies to other suitable mounting positions.

Step 2: Apply the Double-Sided Adhesive Tape

Peel the release paper from the double-sided adhesive tape, then attach the tape firmly to the adhesive mounting area on the back of the screen.

Step 3: Mount the Screen

Place the side with the double-sided adhesive tape onto the cleaned windshield or selected mounting surface. Press gently and evenly to secure the screen in place.

Step 4: Connect the Power Cable

Connect the screen to your vehicle using the 14.8 ft USB-C power cable. For a cleaner installation, route the cable along the interior trim, under the floor mat, or through suitable gaps where possible.

Note:

Make sure the screen does not block the driver’s view or interfere with safe driving, airbags, mirrors, window operation, or any vehicle controls.

Chapter 3 Control Methods and Features

INT21A can be controlled through the SSHub mobile app or compatible head units / AI boxes with the built-in CarIoTHub app. Some advanced control features, such as CPAA-based control through DriveAgent, are still under development and are not currently available.

Note:

The LED message sign can only be connected to one control device at a time. If it is already connected to another phone or in-car device, disconnect it first before pairing again.

3.1 Control via SSHub Mobile App

SSHub is the mobile app used to connect, configure, and control the INT21A LED message sign from a smartphone.

3.1.1 Download the SSHub App

Before connecting the LED message sign, download and install the SSHub app on your phone.

Support Note:

If you have trouble downloading or installing the SSHub app, please contact our customer support team for assistance.

3.1.2 Bluetooth Connection

Prerequisites

Before connecting the LED message sign, make sure that:

① The LED message sign is powered on.

② Bluetooth is enabled on your phone.

Steps

1. Open the SSHub app and log in to your account.

1. In the SSHub app, search for nearby devices.

or,

1. Select your LED message sign from the device list, then follow the on-screen instructions to connect and bind the device to your account.

3.1.3 Function Description

After the LED message sign is connected to the SSHub app, you can control the screen and manage display content from the Device page.

The available functions may vary depending on the app version, device firmware, and connected device status.

3.1.3.1 Main Control Panel

3.1.3.2 Display Modes

The SSHub app provides several display modes for the LED message sign.

Note:

① Music mode requires the SSHub app to remain open and running in the foreground. If the app is sent to the background or closed, the music visualizer effect may not work properly.

② The Dual Screen function requires two LED message signs. If the left and right screen devices are not connected, the app will show a connection reminder.

3.1.3.3 Content Creation

+ Add Program: Creates a new display program and sends it to the LED screen.

DIY Creative Lab

[①] Pattern Doodles

Tap Pattern Doodles to create custom pixel-style artwork for the LED message sign.

In the graffiti editor, you can:

[②] Text Effects

The Text Effects page allows you to create text content and adjust how it appears on the LED message sign.

3.2 Control via CarIoTHub In-Car App

CarIoTHub is an in-device control hub that allows compatible head units or AI boxes to discover, pair, and control supported CarIoTHub ecosystem accessories, including the INT21A LED message sign.

When connected to a CarIoTHub-enabled device, the LED message sign can be controlled directly from the in-car screen.

3.2.1 Compatibility

Current compatible devices include:

① Head Units: X10, S8G4

② AI Boxes: CB4, CB4PL, CB6, CB7

Note: Compatibility may vary depending on the device model, system version, and CarIoTHub app version. More ATOTO head units and AI boxes may become compatible through future system or app updates. Please keep your device system and app updated for the latest compatibility support.

3.2.2 Bluetooth Connection

Prerequisites

Before connecting the LED message sign, make sure that:

① The LED message sign is powered on.

② Bluetooth is enabled on your compatible head unit or AI box.

③ The CarIoTHub app is available on your head unit or AI box.

Steps

1. Open the CarIoTHub app.
2. Tap the “+” icon in the top-right corner to go to the device connection page.

1. Tap the [Premium Bluetooth LED message] icon to search for nearby Bluetooth devices.

1. Choose your LED message sign from the device list to connect.

1. Tap the connected LED message sign to open its device management page.

3.2.3 Function Description

After the LED message sign is connected, you can manage and control it from the device management page in the CarIoTHub app.

3.2.3.1 Main Control Panel

3.2.3.2 Display Mode

Tap the mode selector at the top of the content area to switch between different display modes.

Note:

① Music mode requires the CarIoTHub app to remain open and running in the foreground. If the app is sent to the background or closed, the music visualizer effect may not work properly.

② The Dual Screen function requires two LED message signs. If the left and right screen devices are not connected, the app will show a connection reminder.

3.2.3.3 Creative Workshop

The DIY Creative Lab allows you to create custom content for the LED message sign. You can add graffiti or text, adjust display effects, and send the content to the screen.

① Add Graffiti

Tap Add Graffiti to create custom pixel-style artwork for the LED message sign.

In the graffiti editor, you can:

② Add Text

Tap Add Text to create and edit custom text content.

In the text editor, you can enter text and adjust the following settings:

3.2.3.4 Media Library

Tap Media Library to access saved materials, animations, images, or preset display content.

3.3 CPAA Scenario — Planned Feature

The DriveAgent mobile app is planned to support accessory control within CarPlay / Android Auto environments in a future update.

Once available, this feature may allow users to control the LED message sign on CPAA-capable non-ATOTO head units.

Note: CPAA in-dash control via DriveAgent is currently under development and is not available yet. Please check for future app or firmware updates.

Chapter 4 Specification