Relacart UD-903: Wireless Conference Microphone Base
Model UD-903
Overview
The UD-903 is a wireless desktop conference microphone base designed for use with professional gooseneck microphones in modern conference environments.
Its large-capacity removable lithium battery provides over 24 hours of continuous operation, ideal for extended sessions and multi-day events.
The high-contrast OLED display, direct USB-C charging port, and excellent RF interference immunity make it a robust and flexible solution for wireless conference systems.
Technical specifications
Device Type
Wireless desktop conference microphone base for gooseneck
Main Application
Wireless conference microphone for corporate, government, and educational rooms
Carrier Frequency Range
521.25 MHz – 936.85 MHz
Oscillation Mode
PLL frequency synthesis
RF Bandwidth
134 MHz
Maximum Deviation
±45 kHz
Harmonic Radiation
45 dB below the main carrier
Microphone Interface
Locking 3-pin balanced XLR connector for gooseneck
RF Output Power
30 mW
Recommended Microphone Element
High-quality condenser capsule (Relacart GF series gooseneck)
Battery
Removable rechargeable lithium-ion polymer battery 3.7 V / 2900 mAh
Operating Time
Over 23–24 hours of typical continuous use
Current Consumption
≈ 100 mA (typical)
Charging Port
USB type C (5 V / 800 mA) or dedicated charging box
Display
Bright high-contrast OLED showing frequency, mode, channel, and battery indicator
Indicators
Working status LED (talk/mute), charging and charge-complete indication
Control Functions
Touch button for power on/off and mute; IR pairing function with receiver
RF Technology
RFI shielding to suppress external RF interference (mobile phones, etc.)
Dimensions
162 × 125 × 54 mm (L × W × H)
Weight
≈ 910 g
Base
Insulating non-slip rubber to reduce table impacts and vibrations
System Compatibility
UR-222/UR-223 wireless receivers and wireless conference systems such as WDC-903
Applications
Conference rooms, parliaments, hotels, convention centers, boardrooms, and training spaces
Key features
- Wireless gooseneck microphone base with a locking 3-pin balanced XLR connector for professional conference capsules.
- Removable lithium-ion polymer battery with a typical operating time exceeding 23–24 hours per charge.
- Integrated USB-C port and compatibility with a special charging box for flexible charging options.
- Bright OLED display showing battery capacity, frequency, channel, and conference status or receiver mode.
- Excellent rejection of interference from mobile phones and other RF sources thanks to its shielding technology.
- Silent touch switch with LED indication to control talk/mute status without mechanical noise.
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