We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Small blue Bluetooth 4.1 receiver with 3.5mm plug

ESTONE

ESTONE AX-03 3.5mm Bluetooth 4.1 Stereo Audio Adapter Converter Receiver, Blue

SKU CH-FMN5-TF53T

Bluetooth 4.1 receiver adds wireless audio to any 3.5 mm headphones for up to 6 hours of talk time

  • ColorBlue
  • TypeBluetooth Accessories
  • Talk TimeUp to 6 hour(s)
  • Wireless music with Bluetooth 4.1 connectivity
  • Clear calls using A2DP, AVRCP, HFP, HSP protocols
  • Connect two phones simultaneously for convenience
  • Up to 6 hours talk time per charge
  • 5mm jack fits most headphones easily

What the adapter does

The ESTONE AX-03 adds Bluetooth 4.1 reception to any 3.5 mm stereo input, letting wired headphones or speakers stream audio wirelessly from a phone or tablet. It pairs with two devices simultaneously, so calls and music can share the same connection without re-pairing.

Range and battery limits

The Class 2 radio reaches roughly 30 m in open air, but walls and interference will reduce usable distance. A 3.7 V 60 mAh cell delivers up to 6 hours of talk time, after which the unit must be recharged before further use.

Deciding specification

Bluetooth 4.1 is the sole wireless standard supported, so the adapter works only with sources that implement that version or a backward-compatible implementation. Buyers needing aptX, LDAC or multipoint beyond two devices will find those features absent.

Highlights

  • Wireless music with Bluetooth 4.1 connectivity
  • Clear calls using A2DP, AVRCP, HFP, HSP protocols
  • Connect two phones simultaneously for convenience
  • Up to 6 hours talk time per charge
  • 5mm jack fits most headphones easily

Specifications

BrandESTONE
SeriesAX-03
ModelAX-03
ColorBlue
TypeBluetooth Accessories
Talk TimeUp to 6 hour(s)

Questions about this item

How do I choose between the available colours for the AX-03 receiver?

The adapter comes in Black, White, Blue and Green; pick the colour that matches your headphones or personal style — all versions share the same Bluetooth 4.1 hardware and 60 mAh battery.

What does the 6-hour talk time mean for daily use with my headphones?

The built-in 3.7 V 60 mAh battery delivers up to six hours of calls or music streaming before you need to recharge via the micro-USB port.

Which Bluetooth profiles does the 4.1 adapter support and what do they enable?

It supports A2DP for stereo audio, AVRCP for playback control, and HFP/HSP for hands-free calls, letting you pair two phones simultaneously.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.