1. Introduction
The GLB Green Level Berlin Ultrasonic Bird Repeller is an electronic device designed to deter birds, such as pigeons and gulls, from unwanted areas. It is ideal for use on balconies, terraces, roofs, trees, branches, and boats, preventing birds from perching and nesting. This device operates by emitting ultrasonic waves that are unpleasant for birds but generally imperceptible to humans.
2. Product Overview
The repeller utilizes ultrasonic technology to create an uncomfortable environment for birds. Birds possess a hearing range that allows them to detect frequencies beyond human perception. The device emits varying ultrasonic frequencies to prevent birds from becoming accustomed to a single sound pattern. Over time, birds will associate the protected area with discomfort and seek alternative locations.

Image 2.1: Front view of the GLB Green Level Berlin Ultrasonic Bird Repeller, showing the speaker grille.

Image 2.2: Top view of the GLB Green Level Berlin Ultrasonic Bird Repeller, showing the overall shape.

Image 2.3: Side view of the GLB Green Level Berlin Ultrasonic Bird Repeller, showing the control knob for frequency adjustment.
3. Setup and Installation
3.1 Battery Installation
The device operates on 3 rechargeable batteries, which are included. Ensure the batteries are correctly inserted according to the polarity markings inside the battery compartment. The battery compartment is typically located on the back or bottom of the device.
3.2 Placement Recommendations
Proper placement is crucial for the effectiveness of the ultrasonic repeller. Consider the following guidelines:
- Clear Path: Do not use the device if there are obstacles such as walls, windows, thick branches, trunks, or dense vegetation between the repeller and the area to be protected. Ultrasonic waves do not penetrate solid objects and their effectiveness will be significantly reduced.
- Proximity to Birds: Ensure the device is placed close to where birds are active. If birds are too far from the unit, its effectiveness will be limited.
- Remove Nests: Any existing bird nests must be removed from the area before activating the repeller.
- Clean Area: Before deployment, thoroughly clean the area with plenty of water to remove any bird pheromones. This helps prevent birds from re-marking the territory.
- Mounting Options: The device can be hung or tied using a cable, tape, or nails. It features a mounting hole for easy installation.

Image 3.1: Back view of the GLB Green Level Berlin Ultrasonic Bird Repeller, illustrating the mounting hole for installation.

Image 3.2: The bird repeller installed on a balcony railing, showing a common placement scenario.
4. Operation
The GLB Green Level Berlin Ultrasonic Bird Repeller operates continuously without a motion sensor. It cycles through varying ultrasonic frequencies to maximize its deterrent effect and prevent birds from adapting to a single frequency.
4.1 Operating Cycles
The device employs different cycles of ultrasonic emission and standby periods:
- 4 seconds of 18 KhZ - 32 Khz frequency, followed by 20 seconds in standby.
- 5 seconds of 18 KhZ - 32 Khz frequency, followed by 35 seconds in standby.
- 3 seconds of 18 KhZ - 32 Khz frequency, followed by 50 seconds in standby.
These varied cycles ensure that birds do not habituate to the ultrasonic emissions, maintaining the repeller's effectiveness over time. An LED indicator on the device provides visual confirmation of operation.

Image 4.1: Diagram showing the continuous ultrasonic cycles and standby periods for effective bird deterrence.
5. Maintenance
To ensure optimal performance and longevity of your GLB Green Level Berlin Ultrasonic Bird Repeller, follow these maintenance guidelines:
- Cleaning: Periodically wipe the device with a soft, damp cloth to remove dust and debris. Do not use harsh chemicals or abrasive cleaners.
- Battery Care: As the device uses rechargeable batteries, ensure they are charged as needed. If the device is stored for an extended period, remove the batteries to prevent leakage.
- Obstacle Clearance: Regularly check the area around the repeller to ensure no new obstacles (e.g., growing vegetation, stored items) are blocking the ultrasonic waves.
6. Troubleshooting
If you experience issues with your bird repeller, consult the following troubleshooting tips:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not turning on. |
|
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| Birds are still present. |
|
|
| LED indicator not flashing. |
|
|
7. Specifications
Technical details for the GLB Green Level Berlin Ultrasonic Bird Repeller (Model GLB324-2):
- Model Number: GLB324-2
- Power Source: 3 rechargeable batteries (included)
- Consumption: 18 mA (operating), 20 µA (standby)
- Power Output: 0.08 W
- Frequency Range: 18-32 kHz +/- 10%
- Sound Pressure: Approximately 78 dB
- Display: LED indicator
- Effective Area: Up to 150 m²
- Product Dimensions: 10 x 10 x 5 cm
- Weight: 280 grams
- Material: Plastic
- Waterproofing: IP44

Image 7.1: Back label of the device, detailing technical specifications and showing the CE mark.
8. Warranty and Support
For warranty information or technical support, please refer to the documentation provided with your purchase or contact GLB Green Level Berlin customer service. Keep your proof of purchase for warranty claims.
Manufacturer: GLB Green Level Berlin
Contact: info@ahuyentando.com