Coolpie GT-HDWL15
Coolpie Wireless HDMI Transmitter and Receiver (Model GT-HDWL15) - Instruction Manual
Model: GT-HDWL15 | Brand: Coolpie
Introduction
This manual provides comprehensive instructions for the setup, operation, and maintenance of your Coolpie Wireless HDMI Transmitter and Receiver. This device is designed to transmit high-definition video and audio signals wirelessly, offering flexibility and convenience for various applications.
Package Contents
Please verify that all items listed below are included in your package:
- 1x HDMI Transmitter Unit
- 1x HDMI Receiver Unit
- 2x External High-power Antenna
- 2x USB-C Charge Cable
- 1x Female to Female Adapter
- 2x Male to Female Adapter
- 1x User Manual

Image: Contents of the Coolpie Wireless HDMI Transmitter and Receiver package, including the transmitter, receiver, antennas, USB-C cables, and various HDMI adapters.
Product Overview and Key Features
The Coolpie Wireless HDMI Transmitter and Receiver system offers a robust solution for wireless video and audio transmission. Key features include:
- Wireless Long-Range Transmission: Equipped with an external antenna, it provides a range of up to 450 ft outdoors, 170 ft indoors, and 35-70 ft through walls.
- Stable Transmission & Ultra-Low Latency: Utilizes single-band 5.8GHz technology for robust signal strength and near-zero delay (approximately 0.1s).
- 4K Decode 1080P Full HD Output: Supports 4K input and delivers crystal-clear 1080P@60Hz output.
- Plug-and-Play Operation: Requires no complex software installation; simply connect the transmitter and receiver.
- Fast-Cooling Metal Casing: Engineered with a specialized ventilation hole design to prevent overheating and ensure stable signal transmission.
- Wide Compatibility: Supports various devices including TVs, projectors, laptops, and game consoles.

Image: The Coolpie Wireless HDMI Transmitter and Receiver units with their orange high-power antennas.
Setup Instructions
Follow these steps for initial setup:
- Connect the Transmitter (TX): Plug the HDMI Transmitter unit into the HDMI output port of your source device (e.g., laptop, game console, DVD player). Ensure the external high-power antenna is securely attached to the transmitter.
- Power the Transmitter: Connect the USB-C charge cable to the transmitter's DC 5V port and plug the other end into a power source (e.g., a wall adapter, not a device USB port, for stable streaming).
- Connect the Receiver (RX): Plug the HDMI Receiver unit into an available HDMI input port on your display device (e.g., TV, monitor, projector). Ensure the external high-power antenna is securely attached to the receiver.
- Power the Receiver: Connect the USB-C charge cable to the receiver's DC 5V port and plug the other end into a power source.
- Automatic Pairing: The transmitter and receiver are pre-paired from the factory. After both units are powered on, they should automatically connect within 30-60 seconds. The red LED indicator will be steady on, and the green LED indicator will flash during pairing, then become steady on once paired.
- Select Input Source: On your display device (TV, monitor, projector), select the correct HDMI input channel where the receiver is connected.

Image: Visual guide for connecting the transmitter to a laptop and the receiver to a television for wireless display.
Video: A demonstration of the plug-and-play setup process for the Coolpie Wireless HDMI Transmitter and Receiver, showing connection to a laptop and a monitor.
Operating Instructions
The Coolpie Wireless HDMI system supports various display modes and scenarios:
Display Modes: Mirror and Extend
- Mirror Mode: Duplicates your source device's screen onto the connected display.
- Extend Mode: Extends your source device's desktop, allowing for a multi-screen workspace.
To switch between display modes on a Windows laptop, press Win + P and select your desired mode.

Image: Illustration of Mirror Mode, where the laptop screen is duplicated on the external display, and Extend Mode, where the external display acts as a secondary monitor.
Multi-Receiver Support
One transmitter can be connected with up to four receivers, allowing you to broadcast your source signal to multiple displays simultaneously.

Image: Diagram illustrating how one transmitter can send signals to multiple receiver units connected to different displays.
Pairing Instructions
The transmitter and receiver units are pre-paired from the factory. If re-pairing is necessary, follow these steps:
- Prepare for Pairing: Ensure both transmitter and receiver units are powered off.
- Initiate Transmitter Pairing Mode: Press and hold the "Pair" button on the transmitter. While holding the button, connect the USB-C power cable to the transmitter. Continue holding the "Pair" button until the green light starts blinking, then release it.
- Initiate Receiver Pairing Mode: Press and hold the "Pair" button on the receiver. While holding the button, connect the USB-C power cable to the receiver. Continue holding the "Pair" button until the green light starts blinking, then release it.
- Connect for Pairing: Use the provided HDMI Dual Female Adapter to connect the HDMI output of the transmitter directly to the HDMI input of the receiver.
- Confirm Pairing: When the green light of the transmitter is steady on and the receiver's green light is still blinking, the pairing is complete.
- Finalize Setup: Disconnect the HDMI Dual Female Adapter. Unplug both units from power, wait a few seconds, then plug them back into their respective power sources. The units are now paired and ready for use.
Video: Step-by-step guide on how to quickly re-pair the Coolpie Wireless HDMI Transmitter and Receiver if the HDMI connection is lost.
Video: Instructions on how to set video and audio output settings, including changing the audio format to Stereo (PCM) or TV Audio Out.
Maintenance
To ensure optimal performance and longevity of your Coolpie Wireless HDMI system, please observe the following maintenance guidelines:
- Heat Dissipation: The metal casing and ventilation holes are designed for efficient heat dissipation. Ensure that the units are placed in a well-ventilated area and that the ventilation holes are not obstructed.
- Cleaning: Use a soft, dry cloth to clean the exterior of the units. Avoid using liquid cleaners or abrasive materials.
- Storage: When not in use for extended periods, store the units in a cool, dry place away from direct sunlight and extreme temperatures.
- Power Supply: Always use the provided USB-C cables and a stable 5V/1A power adapter for each unit. Avoid using device USB ports for power if possible, as they may not provide sufficient and stable power.

Image: Close-up view of the transmitter unit, emphasizing its metal casing and ventilation holes designed for fast cooling.
Troubleshooting
If you encounter issues with your Coolpie Wireless HDMI system, refer to the following common problems and solutions:
- No Signal on Display:
- Ensure both transmitter and receiver are properly powered and their LED indicators are on.
- Verify that the HDMI cables and adapters are securely connected to both the source and display devices.
- Confirm that the display device is set to the correct HDMI input channel.
- Re-pair the transmitter and receiver units as described in the "Pairing Instructions" section.
- Reduce the distance between the transmitter and receiver, or remove any obstructions (walls, furniture) that may be interfering with the signal.
- Poor Video/Audio Quality or Lag:
- Ensure both units are receiving stable 5V/1A power from a wall adapter, not a device's USB port.
- Check for strong interference from other 5.8GHz wireless devices. Try changing the location of the units.
- Verify that your source device's output resolution is set to 1080P@60Hz for optimal performance with the receiver's output capabilities.
- For audio issues, ensure your TV's audio output settings are configured to Stereo (PCM) or TV Audio Out.
- Units Overheating:
- Ensure proper ventilation around both units. Do not cover the ventilation holes.
- Avoid continuous 24/7 operation if possible, or ensure adequate cooling if prolonged use is necessary.
Specifications
| Feature | Detail |
|---|---|
| Model Number | GT-HDWL15 |
| Product Dimensions | 11.8 x 1.41 x 0.31 inches |
| Item Weight | 1.01 pounds |
| Connectivity Technology | HDMI Wireless (5.8GHz) |
| Video Input Resolution | Up to 4K |
| Video Output Resolution | 1080P@60Hz Full HD |
| Transmission Range (Outdoor) | Up to 450 ft |
| Transmission Range (Indoor) | Up to 170 ft (35-70 ft through walls) |
| Latency | ~0.1s |
| Audio Output Mode | Stereo |
| Surround Sound Channel Configuration | 5.1 |
| Casing Material | Metal (Fast-cooling) |
| Compatible Devices | TVs, Projectors, Laptops, Game Consoles, Tablets, Personal Computers |
Warranty and Customer Support
Coolpie maintains a dedicated and highly professional after-sales service team. Should you encounter any questions or concerns after receiving your order, please feel free to reach out to us via email. Upon receiving your inquiry, we will promptly coordinate with our specialized Quality Inspection Department and R&D (Research and Development) Team to provide comprehensive assistance. Our experts will thoroughly check your case and offer tailored solutions based on your specific needs.
For support, please contact us at: support@coolpie.com
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