The Yesido YAU41 is a 2-in-1 wireless Bluetooth 5.1 audio adapter that functions both as a transmitter and receiver. Designed for car audio systems, headsets, and speakers, it enables seamless wireless streaming from your devices. Equipped with a built-in battery and microphone, this compact adapter allows hands-free calling and uninterrupted music playback in both RX and TX modes. Specifications: Brand: Yesido Model: YAU41 Bluetooth Launcher / Receiver Two Mode Adapter Color: Black Applicable to: Smartphone, Speaker, Headset, Car Audio Item Name: BT to AUX Receiver/Launcher Charging: Type-C Bluetooth Chip: Jieli Bluetooth Version: V5.1 Range: 10 meters Battery Capacity: 180mAh Key Features: Supports both transmitter (TX) and receiver (RX) Bluetooth modes. Bluetooth 5.1 ensures stable and efficient connection. 3.5mm AUX plug for universal compatibility. Built-in battery for wireless convenience. Integrated mic for hands-free calling.