Introduction
Thank you for choosing the August MB420K DAB+ Clock Radio Bluetooth Speaker. This device combines a versatile digital radio with a powerful Bluetooth speaker, offering multiple audio playback options and convenient alarm clock functionalities. This manual provides detailed instructions to help you set up, operate, and maintain your device for optimal performance.
Safety Information
Please read and understand all safety instructions before using this product. Keep this manual for future reference.
- Do not expose the device to rain, moisture, or extreme temperatures.
- Avoid placing the device near heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
- Only use attachments/accessories specified by the manufacturer.
- Unplug this apparatus during lightning storms or when unused for long periods of time.
- Refer all servicing to qualified service personnel.
Package Contents
Ensure all items are present in the package:
- August MB420K DAB+ Clock Radio Bluetooth Speaker
- Power Adapter
- User Manual (this document)

Image: The August MB420K radio, its power adapter, and the user manual as included in the product packaging.
Product Overview
Familiarize yourself with the main components and controls of your MB420K.

Image: Front view of the August MB420K radio, showing the speaker grille, LCD display, and control buttons including Memory, Select, Info/Menu, Scan/Pair, Source, Preset, and Tuning.

Image: Rear view of the August MB420K radio, highlighting the bass reflex tube and various connection ports: 3.5mm Aux Out, 3.5mm Aux In, USB Port, and DC 6.5V Power input.
Controls and Connections:
- Display: LCD screen for information and menu navigation.
- Memory Button: Save and recall preset stations.
- Select Button: Confirm selections.
- Info/Menu Button: Access information and menu settings.
- Scan/Pair Button: Scan for radio stations or initiate Bluetooth pairing.
- Source Button: Switch between DAB, FM, Bluetooth, USB, and AUX modes.
- Preset Buttons: Navigate through preset stations.
- Tuning Buttons: Manually tune radio frequencies.
- Volume/Navigate Dial: Adjust volume and navigate menus.
- USB Port: For MP3 playback from USB flash drives.
- 3.5mm Aux In: Connect external audio devices.
- 3.5mm Aux Out: Connect headphones or external speakers.
- DC 6.5V Power Input: Connect the power adapter.
- Telescopic Antenna: For optimal radio reception.
Setup
1. Power Connection
- Insert the DC plug of the power adapter into the "DC 6.5V Power" input on the back of the MB420K.
- Plug the power adapter into a standard wall outlet.
- The unit will power on automatically or enter standby mode.
2. Antenna Setup
Extend the telescopic antenna fully for best radio reception, especially for FM and DAB signals.
3. Initial Power On and Time Setting
Upon first power-on, the radio may automatically scan for DAB stations and set the time. If not, you can manually set the time and date via the menu.

Image: The radio's display showing the time (11:25:08) and date (30-3-2021), indicating its clock function.
Operating Instructions
1. Radio Modes (DAB/DAB+/FM)
Press the Source button to cycle through DAB, DAB+, and FM radio modes.

Image: The August MB420K radio positioned in a kitchen, illustrating its use as a DAB/DAB+ and FM radio with manual and automatic search options and 30 station presets.
Scanning for Stations:
- In DAB mode, press Scan/Pair to perform a full scan for available DAB stations.
- In FM mode, press Scan/Pair to auto-scan and save stations.
Saving Presets:
- Tune to your desired station.
- Press and hold the Memory button until "Preset Store" appears.
- Use the Navigate dial or Preset buttons to select a preset number (1-30).
- Press Select to confirm.
Recalling Presets:
- Press the Memory button (short press) to enter preset recall mode.
- Use the Navigate dial or Preset buttons to select the desired preset.
- Press Select to tune to the station.
2. Bluetooth Speaker Mode
Connect your smartphone, tablet, or computer wirelessly to the MB420K.

Image: The August MB420K radio wirelessly connected to a smartphone, illustrating its function as a HiFi Bluetooth speaker for streaming music.
- Press the Source button to select "Bluetooth" mode. The display will show "Bluetooth Pairing" or "Bluetooth Connected".
- On your Bluetooth device, enable Bluetooth and search for "MB420K".
- Select "MB420K" to pair. Once connected, you can play audio from your device through the speaker.
3. USB Playback
Play MP3 music files directly from a USB flash drive.
- Insert a USB flash drive containing MP3 files into the USB port on the back of the MB420K.
- Press the Source button to select "USB" mode.
- The radio will automatically start playing the first compatible audio file. Use the Tuning buttons to skip tracks.
4. AUX Input
Connect external audio devices using a 3.5mm audio cable.
- Connect one end of a 3.5mm audio cable to the "3.5mm Aux In" port on the back of the MB420K.
- Connect the other end to the headphone jack or audio output of your external device (e.g., MP3 player, phone).
- Press the Source button to select "AUX" mode.
- Control playback from your external device.
5. Dual Alarm Clock Function
Set up to two independent alarms to wake you up.


Image: Icons for Alarm and Sleep Timer functions, indicating the device's capabilities.
- Press the Info/Menu button, then use the Navigate dial to select "Alarm". Press Select.
- Choose "Alarm 1" or "Alarm 2" and press Select.
- Follow the on-screen prompts to set the alarm time, duration, source (Buzzer, DAB, FM, USB), frequency (Daily, Once, Weekdays, Weekends), and volume.
- Press Select to confirm each setting.
Snooze Function:
When an alarm sounds, press any button (except Power) to activate snooze. The alarm will sound again after a set interval.


Image: Icons indicating USB playback and DAB+ FM radio as alarm sources.
6. Sleep Timer
Set the radio to automatically turn off after a specified period.
- Press the Info/Menu button, then use the Navigate dial to select "Sleep". Press Select.
- Use the Navigate dial to select the desired sleep timer duration (e.g., 15, 30, 45, 60, 90 minutes).
- Press Select to confirm. The radio will turn off after the selected time.

Image: The August MB420K radio with a graphic indicating its automatic shutdown feature, configurable from 0 to 90 minutes, useful for falling asleep to music.
7. Display Settings (Backlight)
Adjust the backlight brightness of the LCD display.
- Press the Info/Menu button, then use the Navigate dial to select "System Settings". Press Select.
- Select "Backlight" and press Select.
- Choose your desired brightness level (e.g., High, Medium, Low) and press Select.

Image: The August MB420K radio's display showing the menu for backlight settings, with options for High, Medium, and Low brightness.
Maintenance
Cleaning:
Wipe the surface of the unit with a soft, damp cloth. Do not use abrasive cleaners or solvents.
Storage:
If not using the device for an extended period, unplug it from the power outlet and store it in a cool, dry place.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power adapter not connected or faulty outlet. | Ensure the power adapter is securely connected to the unit and a working power outlet. |
| Poor radio reception | Antenna not extended or weak signal. | Fully extend the telescopic antenna. Try repositioning the unit for better signal reception. Perform a full scan for stations. |
| Bluetooth not pairing | Device not in pairing mode or already connected to another device. | Ensure the MB420K is in Bluetooth mode and "Bluetooth Pairing" is displayed. Disconnect from any previously paired devices. Restart both devices. |
| USB playback not working | Unsupported file format or corrupted USB drive. | Ensure files are in MP3 format. Try a different USB drive or reformat the current one. |
| Alarm not sounding | Alarm not enabled or volume too low. | Check alarm settings to ensure it is enabled and the volume is set appropriately. |
Specifications
- Model: MB420K
- Brand: August
- Tuner Technology: DAB Plus, FM
- Connectivity: Bluetooth (v4.2), USB, 3.5mm AUX In/Out
- Speaker Output: 5 Watts
- Display: LCD
- Power Source: AC adapter (DC 6.5V)
- Dimensions: 22.5 x 15.7 x 11.6 cm
- Weight: 1 kg
- Material: Wood
- Special Features: Built-In Clock, Dual Alarm, Sleep Timer, 30 DAB/FM Presets
Warranty and Support
For warranty information and technical support, please visit the official August website or contact their customer service. The product is typically covered by a manufacturer's warranty against defects in materials and workmanship.
You can find more information and support at the August Store on Amazon or their official website www.augustint.com.
WEEE Registration No.: UK/WEE/AF0109WY





