Portronics Decibel 21 — Complete Guide

TABLE OF CONTENTS

• Product Overview
• Quick Reference
• What's in the Box
• Controls
• Powering On and Off
• Bluetooth Pairing
• Switching Playback Modes
• Music and Volume Controls
• Hands-Free Calling
• USB Playback
• Micro SD Playback
• AUX Playback
• FM Radio
• TWS Stereo Pairing
• Charging
• Battery and Playtime
• Care & Safety
• Still stuck?

Product Overview

The Portronics Decibel 21 is a 10W wireless soundbar with LED lighting, hands-free calling and multiple playback options. Listen through Bluetooth, USB, Micro SD, FM radio or a compatible 3.5mm AUX connection. It also supports TWS pairing with a second Decibel 21 speaker.

Quick Reference

What's in the Box

Controls

Powering On and Off

• Power ON: Press and hold the Power / Mode Button for about 3 seconds. The LED indicator turns on.
• Power OFF: Press and hold the button for about 2 seconds.
• The speaker may turn off automatically when it is not receiving a Bluetooth signal.

Bluetooth Pairing

1. Turn on the Decibel 21.
2. Enable Bluetooth on your phone, tablet or computer.
3. Search for Decibel 21 in the available Bluetooth devices.
4. Select Decibel 21 to pair.
5. After pairing, the soundbar gives a confirmation tone/prompt.
6. Start music playback on your device.

The Bluetooth range is up to approximately 10 metres in suitable conditions.

Switching Playback Modes

Use the Power / Mode Button to select the required playback mode. The soundbar supports:

• Bluetooth
• FM radio
• USB flash drive
• Micro SD card
• AUX input

Choose the mode that matches the source you want to use.

Music and Volume Controls

Hands-Free Calling

The soundbar has a built-in microphone for Bluetooth calls.

USB Playback

1. Insert a USB flash drive containing compatible music files into the USB port.
2. Switch to USB mode if playback does not begin automatically.
3. Use the playback and track controls to manage the music.

Micro SD Playback

1. Insert a Micro SD card containing compatible MP3 music files into the card slot.
2. The soundbar should start playing supported music from the card automatically.
3. If playback does not begin, switch to the appropriate mode.

AUX Playback

1. Connect a compatible 3.5mm AUX cable from the soundbar's AUX port to your phone, computer or other compatible audio source.
2. Select AUX mode if needed.
3. Start playback on the source device.

FM Radio

The Type-C charging cable can be used as an antenna lead to improve FM reception.

1. Connect the Type-C cable to the soundbar's Type-C port.
2. Turn on the soundbar.
3. Press the Power / Mode Button to select FM mode.
4. Short-press the Play/Pause Button to start automatic channel scanning.
5. Wait for scanning to finish.
6. Use the “+” and “−” buttons to move between available channels, as applicable.

Keep the cable connected during FM use for better reception.

TWS Stereo Pairing

TWS lets two Decibel 21 speakers play together for a stereo listening experience.

1. Disconnect the speakers from any active Bluetooth connection to your phone.
2. Turn on both Decibel 21 speakers.
3. Double-press the Power / Mode Button on one speaker to start TWS pairing.
4. Wait for the two speakers to connect. The manual indicates that the LEDs on both speakers flash blue after a successful connection.
5. Turn on Bluetooth on your phone and connect to Decibel 21.
6. Play audio from your phone.

Important: TWS pairing is only guaranteed to work reliably between two Decibel 21 units from the same production batch. Pairing speakers from different batches may fail or behave inconsistently. Check the batch/date code on both units if TWS pairing doesn't work.

Charging

1. Connect the supplied charging cable to the soundbar's Type-C port.
2. Connect the other end to a suitable USB power source.
3. Allow the soundbar to charge before extended use.
4. Disconnect the cable when charging is complete.

The manual does not specify the exact charging time or a detailed LED charging pattern. Do not infer full-charge status from an indicator unless it matches your unit's instructions.

Battery and Playtime

The soundbar has a 3.7V / 1800mAh battery. The current product FAQ lists approximately 5 hours of playtime. Actual runtime varies with volume, lighting, connection mode and battery condition.

Care & Safety

• Place the soundbar on a stable surface.
• Avoid excessive pressure on the speaker grille and controls.
• Turn off the speaker and unplug the charging cable when not in use.
• Do not use the product near water or in a damp location.
• Keep the soundbar away from excessive heat.
• Do not attempt to repair or disassemble a defective unit yourself.
• Keep the charging port clean and dry.
• Use a suitable USB power source and undamaged cable.

Still stuck?

If the issue persists after performing all troubleshooting steps, please raise a support request.

Our support team will assist you further.

Support

• Visit: www.portronics.com
• Support Portal: support.portronics.com