UGREEN Hi-Res Transmitter / Bluetooth Audio Receiver Adapter – BT503 – 45492 – 18 Months Warranty

The UGREEN BT503 Hi-Res Bluetooth Audio Transmitter & Receiver is a powerful 2-in-1 wireless audio solution designed to upgrade both wired and non-Bluetooth devices. Equipped with Bluetooth 5.3, aptX / aptX HD / aptX Adaptive support, and an intuitive LED display, it delivers low-latency, high-fidelity sound for TVs, PCs, speakers, car stereos, and headphones. With ultra-long battery life and dual-device connectivity, it’s ideal for home entertainment, travel, and daily use.

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Key Features

2-in-1 TX & RX Mode

• Transmitter (TX Mode): Add Bluetooth audio to TVs, PCs, game consoles, and other non-Bluetooth devices

• Receiver (RX Mode): Turn wired speakers, amplifiers, or car stereos into Bluetooth-enabled systems

• Simple mode switching for flexible use

Hi-Res Studio-Quality Audio

• Supports SBC, aptX, aptX HD, and aptX Adaptive codecs

• Delivers richer sound details with reduced latency for a smoother audio-visual experience

• Ideal for music, movies, gaming, and TV watching

Bluetooth 5.3 Performance

• Faster pairing, stronger signal stability, lower power consumption

• Reliable wireless transmission up to 10m / 33ft (no obstruction)

Dual Device Connection

• TX Mode: Connect two Bluetooth headphones or speakers simultaneously

• RX Mode: Pair with two source devices (e.g. two phones), play audio from one at a time

Ultra-Long Battery Life

• Up to 32 hours in RX mode

• Up to 28 hours in TX mode

• Built-in 300mAh rechargeable battery with USB-C fast charging

• Fully charges in about 2 hours

Built-in Microphone for Hands-Free Calls

• Supports clear hands-free calling in RX mode

• Perfect for car use, online meetings, and daily communication

Smart LED Display

• Displays connection status, device name, active codec, and working mode

• Makes pairing and operation simple and intuitive

Universal 3.5mm Compatibility

• Standard 3.5mm AUX audio port

• Compatible with TVs, PCs, laptops, speakers, amplifiers, car stereos, headphones, and more

• Includes 3.5mm / RCA cable support (depending on package)

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Specifications

• Model: BT503

• Bluetooth Version: Bluetooth 5.3

• Bluetooth Profiles: A2DP / AVRCP / HSP / HFP

• Codecs Supported:

  • RX: SBC / AAC / aptX / aptX HD

  • TX: SBC / aptX / aptX HD / aptX Adaptive

• Frequency Response: 20Hz – 20kHz

• Frequency Band: 2400MHz – 2483.5MHz

• Max RF Output Power: 4dBm (EIRP)

• Transmission Distance: Up to 10m / 33ft (no obstruction)

• Audio Port: 3.5mm AUX

• Output Level (RX): ≤630mVrms (RL=100kΩ)

• Input Level (TX): ≤0.75Vrms

• SNR: ≥92dB A-weighted

• THD+N: ≤0.1%

• Charging Port: USB-C

• Battery Type: Polymer Lithium-ion

• Battery Capacity: 300mAh 3.7V (1.11Wh)

• Charging Time: About 2 hours

• Operating Time:

  • RX Mode: Up to 32 hours

  • TX Mode: Up to 28 hours

The data are measured by UGREEN lab but may vary based on specific circumstances.