1. Introduction
Thank you for purchasing the ROJECO PD521 remote dog training collar. This product has been tested to meet stringent quality standards. Please refer to this manual for proper use and care.
1.1 Safety Instruction
- Training collars are intended for training, not punishment. Use properly and with care.
- Ensure the collar is a safe and effective tool for training, building communication, and strengthening your bond with your dog.
- Obey all safety messages to avoid possible injury.
- Do not use if your dog has heart disease, high blood pressure, cerebral thrombosis, skin allergies, etc.
1.2 Reinforce Learning Behaviors
If your dog knows a command but responds inconsistently, a training collar can help sharpen their skills. For example, if your dog responds slowly to a "come" command, you can use the remote transmitter to reinforce the command immediately.
- Set the collar to an initial stimulation level and test it.
- Fit the collar on your dog's neck along with its regular collar.
- Allow your dog to roam in the training area, then give the command and press the stimulation button simultaneously.
- If your dog moves toward you, stop stimulation and praise them.
- If your dog stops before reaching you or turns away, repeat the command and continue stimulation. Stop at the instant they run to you and reward them with praise or treats. Repeat this 3 or 4 times.
2. Package Contents
The package contents vary based on the number of collars purchased:
PD 521-1 (For 1 dog)
- 1 x Remote Transmitter
- 1 x Receiver Collar
- 1 x Collar Strap
- 1 x USB Charging Cable
- 2 x Long Contact Points
- 2 x Short Contact Points
- 2 x Long Conductive Silicone Caps
- 2 x Short Conductive Silicone Caps
- 1 x Test Lamp
- 1 x User Manual
PD 521-2 (For 2 dogs)
- 1 x Remote Transmitter
- 2 x Receivers
- 2 x Collar Straps
- 1 x USB Charging Cable
- 4 x Long Contact Points
- 4 x Short Contact Points
- 4 x Long Conductive Silicone Caps
- 4 x Short Conductive Silicone Caps
- 1 x Test Lamp
- 1 x User Manual
PD 521-3 (For 3 dogs)
- 1 x Remote Transmitter
- 3 x Receivers
- 3 x Collar Straps
- 1 x USB Charging Cable
- 6 x Long Contact Points
- 6 x Short Contact Points
- 6 x Long Conductive Silicone Caps
- 6 x Short Conductive Silicone Caps
- 1 x Test Lamp
- 1 x User Manual

3. Specifications
| Feature | Specification |
|---|---|
| Model | PD 521 |
| Function | Training Dogs |
| Working Modes | Beep, Vibration, Static Shock |
| Static Shock Levels | 1-16 Levels |
| Net Weight | Remote Transmitter: 56g, Receiver: 50g |
| Channels | 3 Channels |
| Remote Range | 1000m / 1100yds / 3300ft |
| Battery Capacity | Remote Transmitter: 300mAh, Receiver: 650mAh |
| Working Time | Remote Transmitter: 30 days, Receiver: 60 days |
| Standby Time | Remote Transmitter: 180 days, Receiver: 650 days |
| Waterproof Level | Remote Transmitter: IPX3, Receiver: IPX7 |
| Material | Plastic, Stainless steel |
| Certifications | CE / FCC / MSDS |
| Suitable for | All size dogs (4-120lbs) |

4. Setup and Initial Use
4.1 Before Using the Dog Training Collar
- Do not expose to extreme heat or store at temperatures above 113°F (45°C).
- Always keep the dog training collar out of reach of children.
- Charge the remote transmitter and receiver for at least 2 hours upon receiving them. The collar cannot receive signals while charging.
4.2 When Using the Dog Training Collar
- Avoid leaving the collar on your dog for more than 18 hours per day.
- If possible, reposition the collar on your dog's neck every 1 to 2 hours.
4.3 Operation and Charging
How to choose USB charger
Use a USB charger with the following parameters: Input: 100-240V ~ 50-60HZ, Output: 5V 1000mA (or 300mA/500mA). You can use a smartphone charger or laptop/computer USB interface.

Charge the remote transmitter
- Connect the charger cable to the charging port.
- Plug the charger into a standard socket.
- The battery icon will flash during charging and be solid when charging is completed.
Charge the receiver
- Remove the rubber cover, connect the receiver to a charger into a standard socket.
- The red indicator light will flash slowly when the receiver is charging. After fully charged, the red indicator light stays on.
Turn the receiver on and off
- Turn On: Press the power button once. The receiver will make a short "beep" sound, indicating it is on.
- Turn Off: Press the power button once. The receiver will make a long "beep" sound and the indicator light will no longer flash.
Check the receiver power
When the receiver is turned on, press the power button twice quickly to check the power:
- 5 beeps: 100% (80-100%)
- 4 beeps: 80% (60-80%)
- 3 beeps: 60% (40-60%)
- 2 beeps: 40% (20-40%)
- 1 beep: 20% (1-20%)
4.4 How to Wear Receiver Collar Correctly
- The receiver should be placed at the bottom of your dog's neck, with the screw caps directly contacting the skin.
- If your dog has thick hair, use longer screw caps.
- Maintain a finger's distance between the collar and your dog's neck. If too loose, static shock effectiveness will be reduced.
- The extra part of the strap can be trimmed or managed by other methods.
- Check the fit to prevent excessive pressure.
- The charging rubber cap must be closely covered when your dog is swimming to prevent water damage. Taking off the receiver is recommended during swimming.
- The receiver will turn off automatically after 10 seconds of continuous "beep" sound when the battery is low.


4.5 How to Change the Channel
The remote transmitter has three channel modes: MODE-1, MODE-2, and MODE-3. The default configuration for PD 521-1 is MODE-1, PD 521-2 is MODE-2, and PD 521-3 is MODE-3.
- MODE-1: Channel cannot be changed. To switch channels, change to MODE-2 or MODE-3 first.
- MODE-2: You can switch between channel 1 and 2 by pressing the CH button. To switch to channel 3, you must first switch to MODE-3.
- MODE-3: You can switch among three different channels by pressing the CH button. Be careful not to change the channel accidentally.
To change channel mode:
- When the remote is in MODE-1, press and hold the CH button for 3 seconds until "2" appears on the LCD screen. Release the button to switch to MODE-2.
- When the remote is in MODE-2, press and hold the CH button for 3 seconds until "3" appears on the LCD screen. Release the button to switch to MODE-3.
- When the remote is in MODE-3, press and hold the CH button for 3 seconds until "1" appears on the LCD screen. Release the button to switch to MODE-1.


4.6 Pairing and Testing
How to pair the remote transmitter and receiver
- Turn on the remote transmitter.
- Press the CH button to choose the signal channel you want to use.
- Press the receiver's power button once; it will make a short "beep" sound, indicating it is on.
- Hold the receiver's power button for 2 seconds until the indicator light keeps flashing.
- Press one of the function buttons (beep, vibration, or static shock) on the remote transmitter to pair.
- If pairing is unsuccessful within 10 seconds, repeat the process. If you have multiple receivers, you can pair them to the same or different channels.
Test the dog training collar functions
- Static Shock Function Test: Use the provided test lamp. Press the static shock button on the remote, and the test lamp will shine. The static shock cannot be seen with the naked eye.
- Vibration Function Test: Press the vibration button on the remote, and the receiver will vibrate.
- Beep Function Test: Press the beep button on the remote, and the receiver will make a beep sound.
Important Notes for Pairing and Testing:
- You must pair the remote transmitter and receiver before first use.
- Remember the dog channel you choose and do not change it, or the receiver will not receive signals.
- When the remote transmitter is turned off, all functions are locked.
5. Operation
5.1 Training Modes
The ROJECO PD521 offers three safe and effective training modes:
- Beep Mode: Provides an audible tone. The beep function is not adjustable.
- Vibration Mode: Delivers a vibration. The vibration function is not adjustable.
- Shock Mode: Delivers a static shock with 1-16 adjustable levels.

5.2 Remote Control Buttons
- Signal Channel Button (CH): Press to choose channel 1, 2, or 3. This connects the remote transmitter to the receiver(s).
- Power Button (Remote): Turns the remote transmitter on and off.
- Static Shock Button: Activates the static shock function.
- Vibration Button: Activates the vibration function.
- Beep Button: Activates the beep function.
- +/- Button: Adjusts the static shock level (1-16 levels).

6. Maintenance
- Regularly examine the remote transmitter for tightness and external damage.
- Clean the screw caps weekly.
- Examine and clean your dog's neck weekly.
- The battery is rechargeable. To maintain battery life, charge it every 2 months if not used often.

7. Troubleshooting (FAQ)
Common Questions
- Q: How old must my dog be to use the training collar?
A: Do NOT use on puppies younger than 6 months. - Q: Can I use this training collar for more than one dog?
A: Yes, you can add one or two receiver collars to the system to control two or three dogs, as three dog channels are available with one remote transmitter. - Q: What should I do if my dog's neck becomes red and irritated?
A: Stop using the collar for a few days. If the condition persists beyond 48 hours, consult your veterinarian. Monitor your dog's skin closely even if it normalizes. - Q: Can I attach a leash to the receiver collar?
A: NO. This can pull the screw caps (contact points) too tightly against your dog's neck. Use a separate collar placed above the receiver collar for leash attachment. - Q: How do I know when to charge the batteries?
A: For the Remote Transmitter, the battery level icon is displayed on the left-down side of the LCD screen. For the Receiver, press the power button twice quickly to check the battery level; if only one beep is emitted, charge it immediately. - Q: How long can I leave the receiver collar on my dog?
A: The receiver collar is not designed for constant wear. We recommend wearing it less than 18 hours per day. - Q: How long should a training session be?
A: Training sessions should be positive and short, ideally 10-15 minutes each time. - Q: What are the proper levels of static shock for my dog?
A: Start with the lowest level and gradually increase to find the best suitable level. Excessive stimulation will cause a strong response. - Q: What is the effective distance of my dog training collar?
A: Without obstacles, the effective distance can be up to 1000 meters. However, factors like telecom signals, magnetic fields, obstacles, battery volume, other wireless devices, land form, and vegetation can influence the actual effective distance. - Q: Once my dog is trained, is it still necessary to wear the receiver collar?
A: Yes, you may need to reinforce your dog's memory with the receiver collar from time to time. - Q: Any other better training methods?
A: Use dog food as a training incentive. After correcting misbehavior, tell your dog what was supposed to be done and what was not. With repetitions, your dog will understand. - Q: I want to test static shock function of receiver collar myself, but it does not work, is anything wrong?
A: When testing the receiver collar by hand or leg, you must touch both 2 screw caps (electrodes) at the same time. Touching only one will not work.
7.1 The dog training collar does not work, or my dog does not respond after correct installation of the dog training collar, how should I solve this problem?
- Make sure the battery of the remote transmitter and receiver collar have enough power to operate.
- Check to see if the receiver collar is turned on.
- Check the signal channel button on the remote transmitter to ensure signal channels are correctly configured.
- Try to pair the remote transmitter and receiver again.
- Take off the receiver collar and test all three functions to work properly.
- Make sure the receiver collar is properly worn and not loose.
- Trim your dog's hair where the screw caps (contact points) can touch the neck.



8. User Tips
- If your dog doesn't respond to the training initially, don't give up or immediately increase stimulation. Try working on it a few times.
- Ensure your dog makes the mental connection between the static shock/vibration/beep and their behavior. This may take a week or more for some dogs.
- Both methods of stopping unwanted behavior and reinforcing learning behaviors can be applied to nearly every training scenario.
9. Reference Size for Different Dogs
This table provides a reference for collar sizing based on dog weight and typical breeds:
| Size (Dog) | Neck (In) | Chest Measurement (In) | Back Length (In) | Type |
|---|---|---|---|---|
| Mini | 7.8-8.6 | 9.8-11.8 | 17.5 | Chihuahua, Yorkshire Terrier |
| Small | 7.8-9.5 | 11.4-14.2 | 9 | Chihuahua, Yorkshire Terrier, Poodle, Pomeranian |
| Medium | 9.0-11.0 | 13.7-16.5 | 11 | Maltese Dog, Shih Tzu |
| Large | 9.6-12.2 | 16.2-18.5 | 12.2 | Miniature Schnauzer, Pekingese |
| Large | 11.8-13.4 | 18.1-20.8 | 13.8 | Schnauzer, English Cocker Spaniel |
| Large | 13.0-14.5 | 20.5-23.2 | 15.7 | Beagle |
| Huge | 17.0-18.9 | 30.0-33.0 | 23.6 | Husky |

10. Warranty and Support
10.1 Warranty
Any defective part will be repaired or replaced at no charge if the appliance has not been tampered with and has been used according to these printed directions.
This warranty is void if the defect is caused by accidental damage, misuse, abuse, neglect, improper repair or alteration by unauthorized persons, or a failure to follow operating instructions provided with the product. This includes adding essential oils directly into the tank and base (if applicable, though not for this product). This warranty does not apply to normal wear and tear or commercial use. In no event shall liability exceed the purchase price paid by the purchaser of the product. There is no liability for any loss—direct, indirect, or incidental—or consequential damage arising out of, or in connection with the use of the product.
10.2 Support
If any problems occur, please contact shopping website customer support for assistance. Our consumer service representative will respond within 1 business day, advise you how to correct the problem yourself or instruct you on how to return the defective unit for repair or replacement.
For a detailed user manual, you can also refer to the official PDF document: ROJECO PD521 User Manual (PDF).






