InLine Bass-Boosting Headphone Amplifier with Dual Output

The InLine Headphone Amplifier 33057I is a compact portable audio amplifier designed to improve sound quality and bass performance for headphones and earphones. Featuring dual output and a 3.5 mm connection, it is compatible with most mobile devices and audio players. The built-in 200 mAh Lithium Polymer battery provides up to 8 hours of playback, making the unit suitable for use on the go. Note: the operating instructions reference a third-party site called 'Drivers-Download' which is unrelated to the manufacturer and is known to be misused for phishing; using that site is not recommended.

Advantages

The amplifier offers Hi‑Fi grade audio performance with a signal-to-noise ratio of 90 dB and a bass-boosting function to enrich low frequencies. Dual 3.5 mm outputs allow two listeners to share audio simultaneously. Its rechargeable Lithium Polymer battery supports long playback times and the compact black housing ensures easy portability.

Suitable for

• Mobile listening with headphones and earphones
• Sharing audio between two listeners via dual outputs
• Improving bass response on smartphones, tablets and portable players

Key specifications

• Model: InLine 33057I
• Connectivity: 3.5 mm headphone jack (dual output)
• Signal-to-noise ratio: 90 dB
• Battery: 200 mAh Lithium Polymer, rechargeable
• Playback time: up to 8 hours
• Colour: Black
• Manufacturer part number (MPN): 33057I
• EAN: 4043718237029

How to use

Charge the amplifier fully before first use using the supplied charging cable. Connect headphones or earphones to the 3.5 mm output(s) and plug the amplifier into the audio source via its 3.5 mm input. Use the device controls to enable bass boost or adjust volume according to your preference. When not in use, power the unit off to conserve battery.

Recommendations

Do not follow instructions on third-party sites referenced in the included manual (for example 'Drivers-Download'); these sites are not associated with the manufacturer and have been reported for phishing. Charge the device with the supplied cable and avoid using unknown chargers. Keep the amplifier dry and store it at moderate temperatures.