• 【Dual Mode Functionality】Seamlessly switch between receiver (RX) and transmitter (TX) modes with one-key operation. RX mode receives Bluetooth signals for wireless music streaming from phones/tablets/laptops to speakers/headphones/car audio. TX mode transmits Bluetooth signals from fitness equipment/laptops/TVs to BT speakers/headphones.
• 【Universal Compatibility】Compatible with any device featuring 3.5mm AUX audio input/output interface, including laptops, tablets, TVs, car audio systems, active speakers, gaming consoles, and both wired and BT headphones.
• 【Advanced Bluetooth 5.3 Technology】Features BT 5.3 chip providing low latency, high stability, fast response, and strong anti-interference capability with automatic reconnection support for reliable wireless connections up to 5-10 meters.
• 【High-Fidelity Audio Quality】Built-in high-performance decoding module with high sampling rate eliminates current noise and background hiss, delivering clear and distortion-free Hi-Fi audio output for superior listening experience.
• 【Hands-Free Calling Safety】Built-in microphone enables crystal-clear hands-free calling, enhancing driving safety during phone conversations and supporting video conferences in various scenarios.
• 【Portable Design & Long Battery Life】Compact aluminum alloy construction (5.7 x 3.2 x 1.4cm, 181g) with 200mAh battery providing 8-10 hours of continuous use, perfect for travel and mobile applications.

Specifications:

• Model: B4S
• Material: ABS plastic body with aluminum alloy housing 
• Battery Capacity: 200mAh
• Working Voltage: 12-24V / DC5V
• Input Current: 5V1A
• Transmission Distance: 5-10m
• BT Version: 5.3
• Operating Temperature: 0-55℃
• Product Size: 5.7cm (H) x 3.2cm (W) x 1.4cm (D)
• Product Weight: 181g
• Charging Time: Approximately 2 hours
• Battery Life: RX mode 8 hours, TX mode 10 hours
• Interface Type: Type-C charging port, 3.5mm AUX audio interface