ProStereo D1

Wireless Hi-Fi
Headphone Amp + DAC
Perfect blend of design and craftsmanship


The overall body of ProStereo™ D1 is made of aluminium in a unique and fashionable space grey colour. Its main body is specially designed in the shape of a triangular prism. With a smooth contour, the product may stand vertically or lie flat on all three sides, giving a touch of flexibility. Moreover, laser diamond cutting technology was used to trim out the periphery of ProStereo™ D1’s “Rotatable volume knob with LED light guide” and “disc-type charging dock”, making the product an excellent and detailed craft that will satisfy one’s aesthetic senses.

Besides, ProStereo™ D1 has retained the “clip design” and a high level of portability. The use of Bluetooth wireless headphone amplifier minimizes the number of cable required, enabling users to easily and conveniently enjoy high-definition music.

Space grey aluminium triangular prism body

Disc-type charging dock

Rotatable volume knob with LED light guide and the “Clip” design

2017 Hong Kong Awards for Industries (HKAI):

The most prestigious product design award in Hong Kong which is championed by the Government, the HKAI was launched in 2005 by merging the former Hong Kong Awards for Industry and Hong Kong Awards for Services, established in 1989 and 1997 respectively. The HKAI aims to recognize the outstanding performance and achievements of Hong Kong enterprises in enhancing their competitiveness in various aspects. The symbol of the HKAI, expressed both in the award logo and in the trophies conferred on winners, juxtaposes two precious elements, a pearl and a pierced jade amulet, to form a design which has happy connotations in both Chinese and Western contexts. In Chinese, the two words together signify a perfect match. In the Western context, the two symbols together form the letter ‘Q’, which is widely associated with the concept of quality.

We are extremely honored that ProStereo™ D1 Wireless Hi-Fi Headphone Amp+DAC  to receive this most prestigious level award in Hong Kong in “Consumer Product Design” category. We are earnestly grateful for the recognition received for our works. This achievement has fully manifested our continuous commitment to strive for excellence in product development and receive social recognition.

Winner List of 2017 Hong Kong Awards for Industries Official Website can be downloaded from here!

Gold Prize Winner of 2017 Electronic Industries Awards

The Hong Kong Electronic Industries Association (HKEIA), together with the Hong Kong Trade Development Council (HKTDC), organizer of the Hong Kong Electronics Fair (Autumn Edition) and electronic Asia, are organizing the annual product competition for exhibitors at the above fairs every year. The Electronic Industries Award is established to promote the image of outstanding innovation and technology products; stimulate more creativeness within the electronics industry and recognize and reward startups companies producing new products in areas of design and technology.

We are delighted to announce that ProStereo D1 has been awarded as Gold Winners of 2017 Electronic Industries Awards (Audio Visual Products)!! it’s our honor to participate the product presentation session of Hong Kong Electronics Fair (Autumn Edition)!

Winner List of Electronic Industries Association Official Website can be downloaded from here!

A total solution of Hi-Fi audio experiences
Bluetooth with upsampling and high-end headphone

amplifier using AKM chipsets


To deliver excellent performance, the maximum power output of the ProStereo™ D1 has been raised to 40mW+40mW, whilst the total harmonic distortion has dropped to less than 0.02%. The sound is sonorous and solid – more than enough to drive professional headphones, even with high impedance. Besides, it also supports up-sampling technology – no matter with which type of music file users playing on their mobile phones or in USB DAC Mode (MP3, AAC, FLAC, etc.), the audio data can be raised to up to 32-bit / 384kHz and being processed by an independent Hi-Fi DAC. This offers users a quality comparable to that of studio sound. Supporting AAC codec technology, the product can output both clear and stable Hi-Fi audio whether a user plays the music on an iPhone®^ or on certain Android~ mobile phones.

Equipped with the prestigious AKM+ DAC and headphone amplifier chip (AK4376A),with built-in 32-bit high quality audio and a sampling rate up to 384kHz. It not only reduces distortion to an extremely low level, but also enhances music dynamics, so as to maximize the overall performance – whether used in wireless headphone amplifier or USB DAC mode.

AKM+ DAC & headphone amplifier chip

Support AAC audio codec

For Real Music Lovers
USB DAC complies with
Hi-Res Audio certification


In addition to wireless playback, ProStereo™ D1 supports standard USB audio function. Simply connect the USB data cable and external accessories# (supplied along with the product) directly to iOS, Android~ device or computer audio source (CAS), it can be used as an external USB DAC. ProStereo™ D1 also fully complies with the Hi-Res Audio! certification requirements of the Japan Audio Society. By using Hi-Res audio devices and music files together with the product’s enclosed complimentary USB Type-C cable, users will be able to experience sounds of original quality.


Fully complies with Hi Res Audio certification

Structure of ProStereo D1

Other Features
Hi-Res Audio certification

Fully complies with the Hi-Res Audio! certification requirements of the Japan Audio Society

AAC codec
Sampling Rate Converter

Upsampling to 32bit / 384kHz

Multipoint Connectivity

Allows to be connected to two Bluetooth devices at the same time

ProStereo D1
•   Bluetooth Specification

Version 4.1

•   Profile Support


•   Range of Frequency


•   Operating Distance

Up to 10 meters

•   Talk Time

Up to 6.5 hours

•   Music Time

With SRC: Up to 5 hours
Without SRC: Up to 6 hours

•   Charging Time

Less than 2 hours

•   Weight

Dongle: 42.7 g
Dock: 62.2 g

•   Dimensions

Dongle: 78.5 (H) x 23 (W) x 22 (T) mm
Charging Dock: 67.0 (D) x 16 (T) mm
Giftbox: 194(L) x 114(W) x 52(H) mm

Box Content

ProStereo D1 Wireless Hi-Fi Headphone Amp


3.5mm Earphone (subject to sales package)


Charging Dock (subject to sales package)


Type-C USB Charging Cable


Quick Start Guide



Product Manual
Press Release

!The product with this logo is conformed to High-Resolution Audio standard defined by Japan Audio Society. This logo is used under license from Japan Audio Society.

~© 2018 Google Inc. All rights reserved. Android is a trademark of Google Inc.

^iPhone is trademark of Apple Inc., registered in the U.S. and other countries.

+AKM is a trademark of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.

#iOS devices need to be equipped with Apple Lightning to USB Camera Adapter and headphones; While Android smart phones need to be equipped with headphone, plus Micro-B USB OTG (On -The-Go) adapter or USB device (depends on Android smart phone). The sales package does not include the accessories described above.

Disclaimer: Bluetooth headset performance time are rough estimates only. Actual performance time is dependent upon various factors, including but not limited to device type and settings, features being used, temperature, humidity, storage condition and battery condition.

ProStereo™ is a brand held by i.Tech Dynamic Global Distribution Ltd.