1. Introduction
This manual provides detailed instructions for the proper use and maintenance of your Sandberg Pocket Radio FM+AM Recharge, Model 421-02. Please read this manual thoroughly before operating the device to ensure optimal performance and longevity.
2. Product Overview
The Sandberg Pocket Radio is a compact, portable device designed for receiving FM and AM radio broadcasts. It features a built-in rechargeable battery and a digital display for easy tuning.

Figure 1: Front view of the Sandberg Pocket Radio, displaying the frequency and controls.

Figure 2: The radio connected to the included earphones, which also function as the FM antenna.
Package Contents:
- 1 x Sandberg Pocket Radio FM+AM Recharge (Model 421-02)
- 1 x Earphone
- 1 x Charging cable (USB-A to USB-C, 50 cm)
3. Setup
3.1 Charging the Battery
- Connect the small end of the included USB-C charging cable to the charging port on the radio.
- Connect the standard USB-A end of the cable to a USB power adapter (not included) or a computer's USB port.
- The radio's display will indicate charging status. A full charge typically takes a few hours.
- Disconnect the charging cable once the battery is fully charged.
3.2 Connecting Earphones
The included earphones are essential for operation as they serve as the antenna for FM reception. Without them, FM reception will be severely limited or non-existent.
- Insert the 3.5mm jack of the earphones into the earphone port on the radio.
- Ensure the connection is secure.
4. Operating Instructions
4.1 Power On/Off
- To power on the radio, press and hold the Power/Mode (ⓘ/M) button for approximately 2-3 seconds. The display will light up.
- To power off the radio, press and hold the Power/Mode (ⓘ/M) button again for approximately 2-3 seconds. The display will turn off.
4.2 Mode Selection (FM/AM)
- While the radio is powered on, short press the Power/Mode (ⓘ/M) button to switch between FM and AM radio bands. The current band will be indicated on the display.
4.3 Tuning Stations
- Automatic Scan: To automatically scan for and store available stations, press and hold the Search (⌕) button. The radio will scan through the frequency range and save stations with strong signals.
- Manual Tuning: To manually tune to a specific frequency, short press the Up (▲) or Down (▼) buttons to adjust the frequency incrementally.
4.4 Volume Control
- To increase the volume, press the Volume Up (+) button.
- To decrease the volume, press the Volume Down (-) button.
4.5 Display Information
The digital display shows the current radio band (FM or AM), the tuned frequency, and the battery level indicator.
5. Maintenance
5.1 Cleaning
- Wipe the radio's exterior with a soft, dry cloth.
- Do not use abrasive cleaners, solvents, or strong chemicals, as these can damage the surface.
- Avoid getting moisture into any openings.
5.2 Battery Care
- To prolong battery life, avoid fully discharging the battery frequently.
- Store the radio in a cool, dry place when not in use for extended periods.
- Recharge the battery periodically if stored for a long time to prevent deep discharge.
6. Troubleshooting
- No Power: Ensure the battery is charged. Connect the radio to a power source using the USB-C cable.
- No Sound: Check that the earphones are securely plugged in. Adjust the volume using the Volume Up (+) button.
- Poor FM Reception: Ensure the earphones are fully plugged in, as they function as the FM antenna. Try repositioning the radio or the earphone cable for better signal.
- Cannot Save Favorite Stations: This model does not support saving favorite radio stations. Stations are found via automatic scan or manual tuning each time.
- Display Not Working: If the display is blank or flickering, try recharging the battery. If the issue persists, contact customer support.
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | 421-02 |
| AM Frequency Range | 522-1710 KHz (9KHz) / 520-170KHz (10KHz) |
| FM Frequency Range | 76-108 MHz |
| AM Sensitivity | <20mV/m |
| FM Signal to Noise Ratio | >40db |
| Maximum Output Power | 6.5mW |
| Battery Capacity | 5000 mAh, 3.7V (1.85 Wh) |
| Connectivity Technology | Auxiliary (for earphones/antenna) |
| Power Source | Battery Powered |
| Item Weight | 60 Grams (2.12 ounces) |
8. Warranty and Support
Sandberg products are manufactured to high quality standards. For information regarding warranty terms and conditions, or for technical support, please refer to the official Sandberg website or contact their customer service directly. Keep your purchase receipt as proof of purchase.





