ACA-i21 Product Instruction

Pairing with iOS/Android Devices

Open Bluetooth on your mobile device. Open the earphone charging box and approach the unlocked mobile phone. Search for the Bluetooth device named "ACA-i21" and click "Connect".

Earbud Operations

Left Earbud Operation

• Pause/Play: Touch twice
• Last Track: Long press 1 second
• Voice Assistant: Touch 3 times
• Answer/End Call: Touch twice
• Reject Call: Long press 1 second
• Turn on/off LED: Touch 4 times

Right Earbud Operation

• Pause/Play: Touch twice
• Last Track: Long press 1 second
• Music Mode / Game Mode: Touch 3 times
• Answer/End Call: Touch twice
• Reject Call: Long press 1 second
• Turn on/off LED: Touch 4 times

Charging Indicator Status

• When Charging: Red light is flashing
• When Fully Charged: Lights are off

Function Description

Basic Functions of Headset

• Power On: After opening the cover of the charging box, it will start up automatically and match automatically.
• Turn Off: Place the earbuds into the charging box and close the cover; the headset will turn off automatically.
• Mono Mode: Open the charging box, pair the headset with your device. After successful pairing, take out one earbud.
• Auto Connection: The headset will automatically connect to the last paired device by simply opening the charging box, if the pairing record is not cleared.

Basic Functions of Charging Chamber

• Clear Pairing Record: Put the earbuds back into the charging box, long press the button inside the charging box for five seconds. After the red light flashes 3 times, the pairing records are successfully cleared.
• Charging Box LED Indicator: When opening or closing the charging box, the indicator will breathe for two rounds. To turn off the LED indicator, open the cover and double-click the button on it. When charging, the red light will keep flashing. When fully charged, the light goes out.

The Main Parameters

Use Attention

The earphones should be stored in a dry and ventilated environment to avoid contact with oil, water, and steam, so as not to affect product performance. Avoid using irritating organic solvents or articles containing these ingredients.

The headset needs to be used correctly. Pay attention to the use environment for the earphones to ensure a smooth connection. It is recommended that the distance between the phone and the headphones is within 10 meters.

If there is any other problem with the earphones, please do not remove the headphone body and its accessories privately, otherwise, it will not be covered by warranty.

To charge the headset, please use the standard car charger or the chargers specified by the company.

To ensure normal use of the headset, please make sure the headset is fully charged.

Troubleshooting & Support

For any issues, please follow the steps below to contact the seller:

• English: Login Amazon Account > Your Orders > Problem with Order > Choose the specific issue > Contact seller
• German: Anmelden Amazon-Konto > Meine Bestellungen > Problem bei Bestellung > Wählen Sie das spezifische Problem > Verkäufer kontaktieren
• Spanish: Iniciar sesión cuenta de Amazon > Sus pedidos > Problema con el pedido > Elija el problema específico > Comuníquese con el vendedor
• French: Identifiez-vous compte Amazon > Vos commandes > Problème avec la commande > Choisissez le problème spécifique > Contacter le vendeur
• Italian: Accedi account Amazon > I miei ordini > Problema con l'ordine > Scegli il problema specifico > Contatta il venditore

Packing List

• Headset
• L/S Silicone Caps
• Charging Cord
• Product Manual

FCC Compliance Information

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.

However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

Caution: Any changes or modifications to this device not explicitly approved by the manufacturer could void your authority to operate this equipment.

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

The device has been evaluated to meet general RF exposure requirements.