1. Introduction
This manual provides essential information for the safe and efficient operation of your Motorola RMU2040 Two-Way Radio Walkie Talkie. Please read this manual thoroughly before using the device to ensure optimal performance and to prevent damage.

Figure 1: Motorola RMU2040 Two-Way Radio Walkie Talkie with belt clip.
2. Package Contents
Your Motorola RMU2040 package includes:
- Motorola RMU2040 Two-Way Radio (4 units)
- Single-unit charger for each radio
- 15-hour Lithium-Ion battery for each radio
- Swivel belt holster for each radio

Figure 2: Included accessories: single-unit charger, Lithium-Ion battery, and swivel belt holster.
3. Setup
3.1. Battery Installation
- Ensure the radio is powered off.
- Align the battery with the battery compartment on the back of the radio.
- Gently push the battery into place until it clicks securely.
3.2. Charging the Battery
- Place the radio with the installed battery into the single-unit charger.
- Connect the charger to a power outlet.
- The charging indicator light on the charger will illuminate to show charging status. A full charge typically takes several hours.
3.3. Attaching the Belt Holster
- Slide the radio into the swivel belt holster until it locks into place.
- Attach the holster to your belt or clothing for convenient carrying.
4. Operating Instructions
4.1. Power On/Off and Volume Control

Figure 3: Top view of the radio with power/volume and channel knobs.
- To power on the radio, rotate the On/Off/Volume knob (leftmost knob on top) clockwise until you hear a click.
- Continue rotating the knob to adjust the volume to your desired level.
- To power off, rotate the knob counter-clockwise until it clicks off.
4.2. Channel Selection

Figure 4: Front view of the radio, showing the display and control buttons.
- Rotate the Channel Selector knob (rightmost knob on top) to choose one of the available channels.
- The RMU2040 supports 4 channels, with 2 activated out of the box.
4.3. Transmitting and Receiving

Figure 5: Side view of the radio, highlighting the Push-to-Talk (PTT) button.
- To transmit, press and hold the Push-to-Talk (PTT) button located on the side of the radio. Speak clearly into the microphone.
- Release the PTT button to stop transmitting and listen for a response.
- Ensure you are on the same channel as the person you wish to communicate with.
4.4. Earpiece Connection
The radio features a port for connecting an earpiece for private communication. This port is typically located on the side of the radio, covered by a protective flap.

Figure 6: User demonstrating proper radio usage in a work environment.
5. Features
- Power Output: 2-watt, covering up to 20 floors or 250,000 square feet.
- Channels: 4 communication groups total, with 2 channels activated by default.
- Frequency: Set to factory default UHF frequencies, suitable for both indoor and outdoor use.
- Battery Life: Equipped with a 15-hour Lithium-Ion battery.
- Durability: Designed as a reliable, simple, heavy-duty radio.
- Water Resistance: Water Resistant.
6. Maintenance
- Cleaning: Use a soft, damp cloth to clean the radio's exterior. Avoid harsh chemicals or abrasive cleaners.
- Battery Care: Fully charge batteries before first use. Store radios and batteries in a cool, dry place when not in use for extended periods.
- Antenna: Do not bend or force the antenna, as this can affect signal quality.
7. Troubleshooting
7.1. No Power
- Ensure the battery is properly installed and fully charged.
- Check that the On/Off/Volume knob is rotated clockwise past the click.
7.2. Cannot Transmit or Receive
- Verify that both radios are on the same channel.
- Ensure the PTT button is fully pressed when transmitting.
- Check the radio's range; obstacles and distance can affect communication. The maximum talking range is 36 miles in optimal conditions.
7.3. Poor Audio Quality
- Adjust the volume knob.
- Ensure the microphone and speaker are not obstructed.
- Move to an area with fewer obstructions or closer to the other radio.
8. Specifications
| Specification | Value |
|---|---|
| Item Weight | 8.6 ounces (0.54 Pounds) |
| Product Dimensions | 7.38 x 1.5 x 2.25 inches |
| Item Model Number | SG_B012B7J2FS_US |
| Batteries | 4 Lithium Ion batteries required (included) |
| Brand | Motorola |
| Color | Black |
| Number of Channels | 4 |
| Special Feature | UHF |
| Frequency Range | 450-512Mhz |
| Talking Range Maximum | 36 Mile |
| Voltage | 3.7 Volts |
| Water Resistance Level | Water Resistant |
9. Warranty and Support
Your Motorola RMU2040 Two-Way Radio comes with a 2 Year Manufacturer Replacement Warranty. For warranty claims or technical support, please contact an authorized Motorola dealer or refer to the official Motorola support channels.
Legal Disclaimer: Motorola Recommends Only Purchasing From An Authorized Dealer.





