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The Douk Audio VFD253 is a multifunction VU meter combining an audio spectrum analyzer, Bluetooth 5.0 receiver, and audio switch compact and elegant device. It features a high-resolution VFD (Vacuum Fluorescent Display) screen with a 25 × 15 point matrix using a green fluorescent display dedicated to real-time music analysis. Compatible with a frequency range from 80Hz to 16kHz, it allows precise audio spectrum visualization with several dynamic display modes and a custom AGC algorithm ensuring smooth and readable rendering at both low and high signal levels.
The VFD253 can operate from multiple audio sources thanks to its built-in microphone, Bluetooth 5.0 receiver, and dual 3.5mm AUX inputs, compatible with smartphones, computers, gaming consoles, amplifiers, or active speakers. It also features a 3.5mm AUX output, allowing it to function as an audio switch within a HiFi or desktop setup.
The device also integrates a high-precision clock function based on an RX8025T quartz oscillator offering ±3ppm accuracy, with an annual drift of less than one minute. It offers 2 clock display modes as well as 5 music spectrum display modes, with many adjustable parameters such as gain, brightness, bar fall speed, peak hold time, and peak decay speed. All settings benefit from power-off memory, avoiding the need to reconfigure the device after shutdown.
Controllable via the included remote control, the VFD253 features a CNC-machined aluminum chassis combined with transparent acrylic panels, combining robustness, retro-futuristic aesthetics, and compactness. Powered by DC 5V, it measures 184 x 75 x 66mm and weighs 322g, making it an ideal accessory to complement a HiFi, gaming, or desktop audio setup.
Compatible with a frequency range from 80Hz to 16kHz, the VFD253 enables detailed audio signal analysis with excellent precision across every frequency band.
Its AGC (Automatic Gain Control) algorithm combined with a custom output curve automatically adapts the display to the signal level in order to avoid displays that are too weak or saturated, ensuring a balanced and pleasant visual rendering in all situations.


The VFD253 can operate from several types of audio sources. It integrates a Bluetooth 5.0 receiver for quick and easy wireless connection, a built-in microphone to capture ambient sound, as well as two 3.5mm AUX inputs to directly connect various audio sources.
This versatility allows it to integrate easily into a HiFi, gaming, or multimedia setup.
In addition to its role as a VU meter, the VFD253 also functions as a high-precision digital clock thanks to its integrated RX8025T quartz oscillator.
With a specified accuracy of ±3ppm and an annual drift of less than one minute, it ensures reliable and stable time display with two available display styles.

The VFD253 offers numerous settings allowing users to adapt the display behavior according to their preferences.
It is possible to adjust:
All settings are saved thanks to the power-off memory function.

| 1 | Mode - |
| 2 | Power On / Source Selection |
| 3 | Mode + |
| 4 | 3.5mm Jack Output |
| 5 | Microphone |
| 6 | 3.5mm AUX Input #2 |
| 7 | 3.5mm AUX Input #1 |
| 8 | USB-C Power Port |
Technical Characteristics
| Specifications | |
|---|---|
| Product Type | VU Meter |
| Inputs | Microphone 2x 3.5mm Jack Bluetooth 5.0 |
| Output | 1x 3.5mm Jack |
| Display | VFD |
| Supported Frequency Response | 80Hz-16KHz |
| Display Modes | Spectrum x5 Clock x2 |
| Brightness Adjustment | 5 modes + auto |
| Gain Adjustment | 5 levels |
| General | |
|---|---|
| Dimensions | 184x75x66mm |
| Weight | 322g |
| Color | Silver |
| Package Contents | 1x DOUK AUDIO VFD253 1x Remote Control 1x USB-A to USB-C Cable 2x Pads |