Equipped with a high-definition OLED screen, the device's operating status and mode parameters are clearly visible. During Bluetooth connection, it intuitively displays available pairing devices for precise selection and seamless connection. It can also simultaneously display song information, providing an immersive audio-visual experience. supports both optical and AUX output/input interfaces, enabling convenient connection to various devices such as , computers, speakers, and amplifiers. driverless plug-and-play, easily upgrading active speakers to Bluetooth speakers. Supports simultaneous connection of two mobile phones or tablets, allowing for free song switching and an immersive stereo sound experience, all under control. TX transmission mode; upgrades older with Bluetooth functionality, allowing simultaneous connection of two Bluetooth headphones/speakers for a low-latency, smooth experience, providing a comfortable and convenient cinematic viewing experience without disturbing family members. Dual-transmit/receive mode; upgraded to dual-transmit and dual-receive mode, allowing connection of two mobile phones, ensuring uninterrupted music playback when switching devices, allowing for unrestricted and carefree music listening. Product Name: Wireless Audio Receiver/Transmitter Product Model: M23 Pro Bluetooth Protocol: A2DP/AVRCP//HFP Bluetooth Version: 5.2 Power Supply: Type-C interface, supports simultaneous charging and use Battery Capacity: 1200mAh 3.7V (4.44Wh) polymer lithium battery Charging Parameters: 5V 2.1A Usage Time: 38 hours in receiver mode / 42 hours in transmitter mode Audio Interface: AUX (input/output) / Optical fiber (input/output) Transmission Distance: Approximately 10-30 meters (in unobstructed environments) Audio Decoding: /AAC/High Performance/Ultra-HD/Adaptive/Low Latency Basic Functions: Audio reception/Audio transmission/USB flash drive playback/Hands-free calling Usage: Driver-free, plug and play Supported Devices: Mobile phones/tablets/computers//speakers/amplifiers/projectors, etc. Color: Black Material: plastic Package Contents: 1*Bluetooth adapter 2*Antenna 1* cable 1*Optical fiber cable 1*AUX cable 1*Charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.