Retevis RB645
Retevis RB645 PMR446 Dual PTT Walkie Talkie Instruction Manual
Einführung
Thank you for choosing the Retevis RB645 PMR446 Dual PTT Walkie Talkie. This manual provides essential information for the safe and efficient operation of your device. Please read it thoroughly before use and keep it for future reference.
Sicherheitshinweise
For detailed safety guidelines, please refer to the official safety document:
Packungsinhalt
Stellen Sie sicher, dass beim Auspacken alle Artikel vorhanden sind:
- Retevis RB645 Zwei-Wege-Funkgerät (4 Stück)
- Gürtelclip (4 Stück)
- Sling (4 units)
- USB-C Charging Cable (2-in-1)
- 1100mAh Li-ion Battery (4 units)

Image: Contents of the Retevis RB645 package, including four walkie-talkies, four belt clips, four slings, a charging cable, and four lithium-ion batteries.
Produkt überview und Hauptmerkmale
The Retevis RB645 is a compact and professional PMR446 two-way radio designed for reliable communication. Key features include:
- Dual-PTT-Design: Features both a front and a side Push-to-Talk button for convenient operation with either hand.
- VOX-Funktion: Enables hands-free communication, allowing you to transmit by voice activation.
- Clear Sound with Squelch: High-quality speaker and adjustable squelch (0-9 levels) ensure clear transmission and reception, even in noisy environments.
- Notfallalarm: Activate local and remote alarms by pressing the side button 2 for immediate assistance.
- USB-C wiederaufladbar: Equipped with an 1100mAh Li-ion battery and a USB-C port for versatile charging options.
- Lizenzfreier Betrieb: Operates on PMR446 frequencies, requiring no license for use.
- Kompakt und tragbar: Measures 106mm x 53mm x 18mm, making it easy to carry.

Image: The Retevis RB645 walkie-talkie highlighting its dual PTT buttons, located on the front and side for flexible use.

Image: Illustration showing two Retevis RB645 walkie-talkies communicating with clear sound, indicating the squelch function for noise reduction.

Image: A person on a bicycle using the Retevis RB645 walkie-talkie, demonstrating the VOX function for hands-free operation.

Image: The Retevis RB645 walkie-talkie with its emergency alarm activated, showing a red light, in a scenario where assistance might be needed.
Installationshandbuch
1. Einbau und Aufladen der Batterie
The Retevis RB645 uses a rechargeable 1100mAh Li-ion battery. Before first use, fully charge the battery.
- If not already installed, carefully insert the Li-ion battery into the battery compartment on the back of the walkie-talkie, ensuring correct polarity.
- Connect the provided USB-C charging cable to the USB-C port on the side of the walkie-talkie.
- Plug the other end of the charging cable into a compatible USB power source (e.g., wall adapter, car charger, power bank).
- The charging indicator light will show the charging status. A full charge typically takes approximately 3 hours.

Image: The Retevis RB645 walkie-talkie connected to a USB-C charging cable, illustrating different power sources for recharging.
2. Anbringen von Zubehör
Attach the belt clip or sling for convenient carrying.
- Gürtelschnalle: Richten Sie den Gürtelclip an den Rillen auf der Rückseite des Funkgeräts aus und schieben Sie ihn nach unten, bis er einrastet.
- Schlinge: Thread the sling through the designated loop on the top or side of the radio.
Bedienungsanleitung
1. Ein-/Ausschalten
Press and hold the power button (usually marked with a circle and vertical line) located on the front panel until the device powers on or off.
2. Kanalauswahl
Use the "CH+" and "CH-" buttons on the front panel to select your desired communication channel. The RB645 supports 16 channels.
3. Push-to-Talk (PTT) Operation
The RB645 features a dual PTT design for ease of use:
- Front PTT: Press the large circular PTT button on the front of the radio to transmit. Release to receive.
- Side PTT: Use the PTT button located on the side of the radio for an alternative transmission method. Press to transmit, release to receive.
4. VOX-Funktion (Sprachgesteuerte Vermittlungsstelle)
Die VOX-Funktion ermöglicht freihändiges Sprechen. Ist sie aktiviert, sendet das Funkgerät automatisch, sobald es Ihre Stimme erkennt.
- Refer to the full user manual (if available) or device settings for specific instructions on how to activate and adjust VOX sensitivity.
5. Rauschsperre
Squelch eliminates background noise when no signal is being received. The RB645 offers 0-9 levels of squelch adjustment.
- Higher squelch levels require a stronger signal to open the receiver, reducing unwanted noise but potentially missing weak signals. Lower levels allow weaker signals but may pick up more background noise.
- Adjustment typically requires programming software or specific key combinations not detailed here.
6. Notfallalarm
Im Notfall können Sie die Alarmfunktion aktivieren:
- Press and hold the side button 2 (often the lower side button) to activate both local and remote emergency alarms.
7. Kanalsperre
To prevent accidental channel changes, you can lock the channel:
- Press and hold the appropriate button (as indicated by the image, likely a side button) for 3 seconds to lock the channel. Repeat to unlock.

Image: The Retevis RB645 walkie-talkie with a visual cue for channel locking, indicating a 3-second press on a button.
Wartung
- Reinigung: Verwenden Sie ein weiches,amp Verwenden Sie ein Tuch, um das Äußere des Radios zu reinigen. Verwenden Sie keine scharfen Chemikalien oder Lösungsmittel.
- Batteriepflege: Um die Akkulaufzeit zu verlängern, vermeiden Sie Überladung oder vollständige Entladung des Akkus. Bewahren Sie Radio und Akku bei längerer Nichtbenutzung an einem kühlen, trockenen Ort auf.
- Wasserbeständigkeit: The RB645 is rated IP54 for water resistance, meaning it is protected against dust ingress and splashing water from any direction. It is not designed for submersion. Ensure the USB-C port cover is securely closed to maintain water resistance.
Fehlerbehebung
| Problem | Mögliche Ursache | Lösung |
|---|---|---|
| Das Radio lässt sich nicht einschalten. | Die Batterie ist schwach oder nicht richtig eingesetzt. | Laden Sie den Akku auf. Stellen Sie sicher, dass der Akku richtig eingesetzt ist. |
| Senden und Empfangen nicht möglich. | Falscher Kanal ausgewählt. Außerhalb der Reichweite. Batterie schwach. | Vergewissern Sie sich, dass beide Funkgeräte auf demselben Kanal eingestellt sind. Gehen Sie näher an das andere Funkgerät heran. Laden Sie den Akku auf. |
| Schlechte Tonqualität oder Rauschen. | Weak signal. Squelch level too low/high. Interference. | Move to an open area. Adjust squelch level. Avoid sources of electronic interference. |
| Die Akkulaufzeit ist kurz. | Battery is old or not fully charged. Frequent transmissions. | Ensure battery is fully charged. Consider replacing old batteries. Reduce transmission time. |
Technische Daten
| Besonderheit | Detail |
|---|---|
| Modellnummer | RB645 |
| Marke | Retevis |
| Farbe | Schwarz |
| Abmessungen (T x B x H) | 1.8 x 5.5 x 13.5 cm (0.7 x 2.17 x 5.31 Zoll) |
| Gewicht | 103 Gramm (0.23 Pfund) |
| Akku-Typ | Lithium-Ionen-Akku (1100 mAh) |
| Bandtage | 3.7 Volt |
| Anzahl der Kanäle | 16 |
| Frequenzbereich | 446.00625 - 446.19375 MHz (PMR446) |
| Maximale Gesprächsreichweite | 2 Kilometer (1.24 Meilen) |
| Besonderheit | Emergency Alarm, VOX, Dual PTT, Squelch |
| Wasserbeständigkeit | IP54 (staubgeschützt, spritzwassergeschützt) |
| Kompatible Geräte | PMR446 devices and compatible headsets |
| Geräuschpegel | 40 Dezibel |
Garantie und Support
Retevis offers a comprehensive warranty and support for your RB645 walkie-talkie:
- Garantiezeit: 3-year warranty for the radio body and a 1-year warranty for accessories.
- Rückgaberecht: 30-tägiges Rückgaberecht ohne Angabe von Gründen.
- Service nach Ablauf der Garantie: Wartungsleistungen werden auch nach Ablauf der Garantiezeit angeboten; die damit verbundenen Kosten trägt der Käufer.
- Kontaktieren Sie den Support: For any inquiries or support needs, please contact us through Amazon. We aim to respond within 12 hours.
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