User Quick Guide

Product Overview

Diagram showing the Left Headset with its indicator cover, microphone (MIC), and earbud button.

Diagram showing the Right Headset with its indicator cover, microphone (MIC), and earbud button.

Key Definitions

• Power on: Press the POWER key for 2 seconds. The red and blue lights flash alternatively.
• Power off: Press the POWER key for 3 seconds. The red light flashes 3 times.
• Answer the call: Press the POWER key once.
• Hang up the call: Press the POWER key once.
• Refuse incoming calls: Press the POWER key for 1 second.
• Interrupt dial-out calls: Press the POWER key once.
• Redial last number: Long press the POWER key for 1 second on the right headset.
• Play/pause: Press the POWER key once.
• Volume +: Triple-click the POWER key on the right headset.
• Volume -: Triple-click the POWER key on the left headset.
• Previous song: Double-click the POWER key on the right headset.
• Next song: Double-click the POWER key on the left headset.
• SIRI: Long press the POWER key for 1 second on the left headset.
• Enter double headset pairing mode:
• Enter single headset pairing mode:

Parameters

Charging Mode

• Charge with the charging dock: The blue light flashes.
• Headset is charged and powers off: The red light is normally on.
• Low battery alarm: Prompts low battery when the battery level is lower than 10%. The red light flashes twice every 5 seconds.

Headsets Pairing Mode

TWS Pairing Mode

Take two headsets out from the charging case, and they will automatically enter TWS pairing mode. Alternatively, manually press the power key for 2 seconds on both headsets simultaneously to power on. They will enter pairing mode directly. If pairing is not made within 5 minutes, the headsets will switch to power-off state.

Single Pairing Mode

Take one headset out from the charging case, and it will automatically enter single pairing mode. Alternatively, manually press the single headset's power key for 2 seconds to power on. Search for the headset model "H-21" and click to connect. If pairing is not made within 5 minutes, the headset will switch to power-off state.

Remark

• Wireless pairing name: bosbos H-21.
• When music is played, place the headset into the charging box. The headsets will disconnect from the mobile phone and switch off. When taken out of the charging case, the headset powers on automatically for connection.
• Connects to the mobile phone automatically after powering on.
• If the headsets cannot connect to the mobile phone, reboot and connect again.
• Maximum input voltage is DC 5V; excessive voltage will damage the charging box.

FCC Statement

NOTE: 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.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the 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.

FCC Radiation Exposure Statement

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

FCC ID: 2ADOMKS11

Safety Precautions

• ❗ Away from high temperature:
• ❗ Away from open flames:
• ❗ Away from water:
• ❗ Please do not drop: