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Red retro-styled portable speaker with carry handle, front grille and control knobs

Dolphin

Dolphin SP411BTRED Retrobox portable speaker Red

SKU CH-BX16-ZCQDV

A portable speaker with Bluetooth, AM/FM/SW radio, USB and SD playback, a 3.5 mm aux input, rechargeable lithium battery with optional D-cell backup and a built-in LED torch

  • Product typeSpeakers
  • Bluetooth streaming from any paired device
  • AM, FM and short-wave radio with high-sensitivity antenna
  • Plays MP3 files from SD cards and USB drives
  • Rechargeable lithium cell plus optional D-cell backup
  • 5 mm aux input and convertible carry strap

Red retro portable speaker

The Dolphin SP411BTRED Retrobox is a compact portable speaker finished in red. It combines Bluetooth streaming with AM, FM and short-wave radio reception. An integrated handle converts to a shoulder strap for easy transport. A built-in LED torch adds a practical emergency light.

Buyers wanting Bluetooth, radio and emergency light

This speaker suits listeners who want wireless playback, multi-band radio and a backup torch in one retro-styled unit. It also accepts USB and SD card media for MP3 files. Buyers who need app-controlled EQ, multi-room synchronisation or rugged waterproofing should look at other models.

3.5 mm aux plus USB and SD playback

A 3.5 mm aux input connects non-Bluetooth sources directly. USB and SD slots play MP3 tracks without a phone. The rechargeable lithium cell provides mains-free listening, while optional D-cell batteries extend runtime when charging is unavailable. Headroom ends when both power sources are exhausted.

How it compares

Measured against everything we stock in Bluetooth & Party Speakers, at today’s prices. Recalculated every night.

Price $30.99
Cheaper than about 67% of the 862 comparable items (median $39.99).

Specifications

Product
Brand nameDolphin
Product typeSpeakers

Questions about this item

What audio source do I need to connect through the 3.5 mm aux input on the Retrobox?

Any device with a standard 3.5 mm headphone jack — phone, tablet, laptop or MP3 player — will play through the speaker when plugged into the aux socket.

Will the Retrobox still receive AM, FM and shortwave stations if I keep an older analogue radio nearby?

Yes, the built-in tuner and high-sensitivity antenna operate independently, so nearby analogue sets do not affect reception on any of the three bands.

How can I confirm the rechargeable lithium battery is charging when I plug the Retrobox into AC power?

The speaker includes an LED torch light; when mains power is connected the torch indicator illuminates to show the internal battery is charging.

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