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SP850 Setup Guide

Radio and speaker setup

Choose FM, Bluetooth, MicroSD, or AUX. Follow the matching steps and check that you hear your audio.

Start SetupFix a problem
Before first use: Remove the protective film from the battery, then reinsert it. Charging instructions.

SETUP

How do you want to listen?

Choose a source to see the setup steps.

Listen to FM radio
  1. Turn the knob to ON. On first use, SP850 starts in FM mode. If needed, press MODE to select FM.
  2. Double-press MENU/OK to scan and save available stations. Wait about 2 minutes.
  3. Press ⏮ / ⏭ to choose a station, then adjust the volume.
Enter a station frequency

In FM mode, use the number buttons to enter a frequency. For 106.2 FM, press 1–0–6–2.

Save and play favorite stations

Save up to 9 favorite stations, one on each number button (1–9).

For units before Batch T25F1, update the firmware to enable this feature.

Save a station

  1. Tune to the station you want.
  2. Hold a number button (1–9) until Channel Saved appears.

Play a saved station

In FM mode, press the station’s number button (1–9) once.

Listen with headphones →

← Change source
Use as a Bluetooth speaker

Note: SP850 cannot send audio to Bluetooth headphones or speakers.

  1. Turn the knob to ON.
  2. Press the Bluetooth button once to select Bluetooth mode.
  3. On your phone or computer, turn on Bluetooth and select Avantree SP850.
  4. Wait for your device to show it is connected, then play audio. Adjust the volume on both devices.
Reconnect next time

Turn the knob to ON. Enable Bluetooth on your previously paired device, then press SP850’s Bluetooth button once.

To connect a different device, hold the Bluetooth button for 2 seconds to disconnect the current device, then pair the new one.

← Change source
Use as a MicroSD card player

Use a MicroSD card up to 32 GB. Supported formats: MP3, WAV, WMA. Audio with a sample rate of 88 kHz or higher is not supported.

  1. Insert the card until it clicks into place.
  2. Turn the knob to ON, then press MODE to select MicroSD mode.
  3. Press ⏮ / ⏭ to change tracks. Press ⏯ to pause or resume. Adjust the volume with the knob.

You can also use the number buttons to select a track.

Set repeat or shuffle
  1. With SP850 in MicroSD mode, press MENU/OK once.
  2. Use ⏮ / ⏭ to choose Repeat. Press MENU/OK.
  3. Select Repeat All, Repeat Folder, Repeat One, Random, or Repeat Off. Press MENU/OK to confirm.

For units before Batch T25F1, update the firmware to enable Repeat Off.

Listen with headphones →

← Change source
Use as a wired speaker (AUX)
  1. Connect a 3.5 mm AUX cable to your device’s headphone/AUDIO OUT jack and SP850’s AUX input (not its headphone output).
  2. Turn the knob to ON, then press MODE to select AUX mode.
  3. Play audio on your device. Slowly adjust the volume on both devices.

Listen with headphones →

← Change source

OPTIONAL · PRIVATE LISTENING

Listen with headphones

Use wired headphones
  1. Plug your 3.5 mm headphones into SP850’s headphone output, not AUX.
  2. Play your audio and slowly raise the volume.

Bluetooth headphones are not supported.

DAILY USE

Charging, sound and screen settings

Charge SP850
  1. Connect the USB-C charging port to a 5 V / 1 A USB power source.
  2. Allow about 2.5 hours for a full charge.

The battery icon flashes while charging and stops flashing when full.

Before first use, remove the protective battery film and reinsert the battery.

Sound modes (EQ)
  1. Put SP850 in MicroSD or Bluetooth mode. Press MENU/OK once.
  2. Use ⏮ / ⏭ to choose Equalizer and press MENU/OK.
  3. Choose a sound setting and press MENU/OK to confirm.

Both modes offer Natural, Rock, Pop, Classic, and Jazz. MicroSD also offers Country; Bluetooth offers Soft.

Change screen or voice settings
  1. With SP850 on, hold MENU/OK to enter System Settings.
  2. Use ⏮ / ⏭ to choose Backlight, Contrast, or Voice Settings. Press MENU/OK.
  3. Select the desired setting and press MENU/OK to confirm. Choose Return to go back.

Backlight choices: 0 seconds, 10 seconds, 30 seconds, 1 minute, 2 minutes, 5 minutes, or 10 minutes. Voice Settings turns spoken prompts on or off.

Fix a problem

Open the symptom that matches your SP850.

No power or no charging
  1. Turn SP850 off. Remove the protective battery film if present and reinsert the battery.
  2. Connect SP850’s USB-C charging port to a 5 V / 1 A USB source.
  3. If the battery icon does not flash, reconnect the cable and try another suitable cable or power source.
  4. After charging, turn the knob to ON.

If the screen stays dark, contact support with the cable and charger you tried.

FM has static or finds no stations
  1. Fully extend SP850’s power cord, which acts as an FM antenna.
  2. Move SP850 away from phones, TVs, and other electrical equipment. Try a location near a window.
  3. Enter FM mode and double-press MENU/OK to scan again. Wait about 2 minutes.
  4. Press ⏮ / ⏭ to test several stations.

Still weak? Try another room or location, then contact support with your location and stations tested.

Cannot find or connect Avantree SP850
  1. Turn the knob to ON. Press the Bluetooth-symbol button once.
  2. If SP850 is connected elsewhere, hold its Bluetooth-symbol button for 2 seconds to disconnect. Turn off Bluetooth on that other device.
  3. Open Bluetooth settings on your intended phone, tablet, or computer and select Avantree SP850.
  4. Start audio to test the connection.

Still unable to pair? Review factory reset, then pair again. If unresolved, contact support.

Connected or in a mode, but no sound
  1. Check SP850’s source: MODE selects FM, MicroSD, or AUX; the Bluetooth-symbol button selects Bluetooth.
  2. Start the source audio. Press ⏯ once if SP850 is muted or paused.
  3. Raise SP850’s knob volume gradually. For Bluetooth or AUX, also raise the source device’s volume.
  4. For speaker listening, remove wired headphones. For AUX, check the cable connects the source’s audio output to SP850’s AUX input.

If silent, test another station, track, or source. Contact support with the source and tests tried.

MicroSD mode missing or files will not play
  1. Reinsert the MicroSD card until it clicks.
  2. Use a card up to 32 GB with MP3, WAV, or WMA files sampled below 88 kHz.
  3. Turn SP850 on and press MODE until MicroSD appears. Press ⏯ if paused.
  4. If needed, test another compatible card with a known working MP3 file.

Still missing or silent? Contact support with card capacity, file format, and sample rate.

Factory reset

Before resetting: A factory reset erases saved FM stations and Bluetooth pairing history. Try the matching troubleshooting steps first.

  1. Turn the knob to ON.
  2. Hold MENU/OK to enter System Settings.
  3. Use ⏭ to find Factory Reset.
  4. Press MENU/OK once.

Save your stations and pair your Bluetooth device again. If the original issue continues, contact support.

Buttons and updates

Buttons and ports
SP850 product overview showing front buttons, top power and volume knob, charging port, AUX input and headphone output
Open the official SP850 diagram full size.
OFF / ON / − / + knob
Turn SP850 on or off; adjust volume.
MODE
Switch FM, MicroSD, and AUX. MicroSD and AUX appear after a source is detected.
Bluetooth-symbol button
Press once for Bluetooth mode or to reconnect the last paired device. Hold 2 seconds to disconnect Bluetooth.
MENU/OK
Press for current-mode settings or to confirm a selection. Hold for System Settings. Double-press in FM mode to start Auto-Search.
⏮ / ⏭
Change station or track; scroll through menu options.
⏯
Mute/unmute FM or AUX; play/pause MicroSD or Bluetooth.
1–0
Enter an FM frequency or MicroSD track number. Use 1–9 for favorites: hold to save, press to recall.
MIC
Built-in microphone for calls in Bluetooth mode.
USB-C; AUX; headphone output
Charging; 3.5 mm audio input; 3.5 mm wired headphone output. Use the matching port.
Update older SP850 units

For SP850 before Batch T25F1, this update enables FM favorites and MicroSD Repeat Off. T25F1 and later do not need this update.

Find your batch number. If unsure of the batch, ask support before updating.

  1. Prepare: Use an empty MicroSD card up to 32 GB. Download and unzip the official SP850 update. Copy both update files to the card.
  2. Update: Turn SP850 on, then insert the card until it clicks. The screen turns black and you hear “Di Di Di.” Wait about 10 seconds for SP850 to restart automatically.
  3. Finish: After the restart, turn SP850 off. Remove the card and delete the update files from it.

Do not turn SP850 off or remove the card during the update.

Open official update and download →