Introduction
This user manual provides comprehensive instructions for the Heaflex D8 Dog Training Collar Accessory, which includes a replacement receiver and a 2-in-1 charger cable. Please read this manual carefully before use to ensure proper operation and to maximize the lifespan of your product. This accessory is designed for use with Heaflex D8 series dog training collars.
Product Overview
The Heaflex D8 accessory set includes a replacement receiver and a versatile charging cable, designed to enhance or replace components of your existing Heaflex D8 dog training system.
- 2-in-1 USB Charging Cable: This technology employs advanced dual charging, capable of charging both the remote control and the receiver simultaneously. It features a dual USB DC round-head interface, supporting 2A fast charging. The USB plug is compatible with various devices, including power banks, car chargers, AC adapters, power boards, laptops, and personal computers (with USB 2.0 interface). The total length is 19.7 inches.
- IP67 Dog Training Collar Receiver: This waterproof (IP67) rechargeable receiver supports three training modes: beep, vibration, and electric shock (adjustable from 1–99V). It features a long-range 1640ft signal reception and an ultra-long 45-day standby time.
- High-Quality Materials: The power cable is made of polyvinyl chloride (PVC), which is soft, elastic, durable, and resistant to stretching and twisting. The receiver is made with anti-bite, wear-resistant materials, suitable for small to large dogs (5–120 lbs), ensuring long-lasting use.
- Safety & Convenience: The receiver includes a one-click off button for instant deactivation, providing quick control in emergencies or when training is complete.

Image: Overview of the Heaflex D8 Dog Training Collar Accessory, showing the receiver and charging cable.
Setup Instructions
1. Charging the Receiver and Remote
Before initial use, fully charge both the receiver and your compatible Heaflex D8 remote control. Use the provided 2-in-1 USB charging cable.
- Connect the dual DC round-head connectors of the 2-in-1 USB cable to the charging ports on the receiver and the remote control.
- Plug the USB end of the cable into a compatible USB power source (e.g., power bank, car charger, AC adapter, laptop USB 2.0 port).
- Allow both devices to charge until their respective indicator lights show a full charge. The receiver has a standby time of up to 45 days when fully charged.

Image: Illustration of the Heaflex D8 remote and receiver being charged simultaneously using the 2-in-1 USB cable.

Image: Close-up of the Heaflex 2-in-1 USB charging cable with dual DC round-head connectors.
2. Fitting the Receiver Collar
Proper fit of the receiver collar is crucial for effective and safe training. The receiver is suitable for dogs weighing 5–120 lbs.
- Place the receiver on your dog's neck, ensuring the contact points are positioned on the underside of the neck, making direct contact with the skin.
- Adjust the strap so it is snug but not too tight. You should be able to fit two fingers comfortably between the strap and your dog's neck.
- Ensure the collar is worn on the side of the neck for safer and more stable positioning. Do not connect a leash to the training collar.

Image: Visual guide demonstrating the correct and incorrect placement of the training collar on a dog's neck, emphasizing side placement and not attaching a leash.
3. Pairing (If Replacing Receiver)
If you are replacing an existing receiver, you may need to pair the new receiver with your Heaflex D8 remote control. Refer to your original Heaflex D8 training collar manual for specific pairing instructions, as procedures may vary slightly between models. Generally, this involves putting the receiver into pairing mode and then activating pairing on the remote.
Operating Instructions
The Heaflex D8 receiver supports multiple training modes and features for effective dog training.
Training Modes
The receiver offers three primary training modes:
- Beep (Tone): Emits an audible sound.
- Vibration: Delivers a tactile vibration.
- Electric Shock: Provides a static stimulation, adjustable from 1–99V. Use this mode as a last resort and always start with the lowest effective level.
Refer to your Heaflex D8 remote control manual for instructions on how to select and activate these modes.

Image: Visual representation of the four working modes of the Heaflex D8 receiver: Tone, Vibration, Shock, and an LED light function. Note: Shock mode should be the last choice.
One-Click Off Button
The receiver is equipped with a convenient one-click off button. Pressing this button will instantly deactivate the receiver, providing quick control for emergencies or when training is completed.
Waterproof Design (IP67)
The receiver boasts an IP67 waterproof rating, meaning it is protected from dust and can withstand immersion in water up to 1 meter for 30 minutes. This makes it suitable for use in various weather conditions and allows your dog to swim or play in water without damaging the device. Ensure the charging port cover is securely closed when near water.
Maintenance
Proper maintenance ensures the longevity and optimal performance of your Heaflex D8 accessories.
- Cleaning the Receiver: Regularly clean the receiver and contact points with a damp cloth. Ensure the device is completely dry before charging or re-use.
- Charging Practices: Always use the provided 2-in-1 USB charging cable. Avoid using damaged cables or non-compatible chargers. Do not overcharge the devices; disconnect once fully charged.
- Storage: Store the receiver and cable in a dry, cool place when not in use.
- Material Durability: The PVC power cable is designed to be soft, elastic, and resistant to stretching and twisting. The receiver's anti-bite, wear-resistant materials contribute to its durability. However, regular inspection for any signs of wear or damage is recommended.
Troubleshooting
If you encounter issues with your Heaflex D8 accessories, refer to the following common solutions:
- Device Not Charging:
- Ensure the 2-in-1 USB charging cable is securely connected to both the device and the power source.
- Try a different USB power source (e.g., another USB port on a laptop, a different wall adapter).
- Inspect the charging cable for any visible damage.
- Receiver Not Responding to Remote:
- Confirm both the receiver and remote are sufficiently charged.
- Ensure the receiver is turned on.
- Re-pair the receiver with the remote control. Refer to the pairing instructions in your original Heaflex D8 manual.
- Check if you are within the 1640ft signal range.
- Inconsistent Stimulation/Vibration:
- Ensure the receiver's contact points are making proper skin contact. Adjust the collar fit if necessary.
- Clean the contact points and the area on your dog's neck.
- Compatibility Issues:
This accessory is specifically designed for the Heaflex D8 series. If you are unsure about compatibility with your specific training neck strap model, please contact Heaflex customer service for verification before purchasing or using.
Specifications
| Product Type | Dog Training Collar Accessory (Replacement Receiver & Charger Cable) |
| Brand | Heaflex |
| Model Compatibility | Heaflex D8 Series |
| Charging Cable Type | 2-in-1 USB DC Round-Head Interface |
| Charging Speed | 2A Fast Charging |
| Cable Length | 19.7 inches (50 cm) |
| Receiver Waterproof Rating | IP67 |
| Receiver Training Modes | Beep, Vibration, Electric Shock (1-99V adjustable) |
| Signal Range | 1640 ft |
| Receiver Standby Time | Up to 45 days |
| Dog Size Suitability | 5–120 lbs |
| Cable Material | Polyvinyl Chloride (PVC) |
| Receiver Material | Anti-bite, wear-resistant materials |
Customer Support
For any questions, concerns, or assistance with your Heaflex D8 Dog Training Collar Accessory, please contact Heaflex customer service. Especially for compatibility verification, it is recommended to reach out to customer service before purchase.
You can typically find contact information on the Heaflex brand website or through the retailer where you purchased the product.



