The BT180-A is a professional-grade, multi-functional audio processing device, integrating six key functions: Bluetooth 5.3 audio transmission, FM stereo transmitter, FM radio, USB flash drive/TF card decoding and playback, USB sound card, and AUX input. It utilizes a high-performance 32-bit MCU and a professional audio aDSP hardware decoding chip, supporting FLAC/WAV lossless audio formats, delivering a high-quality audio experience. A built-in 2800mAh lithium battery provides up to 8 hours of battery life and supports charging while using the device. **FM Transmission Function**: It can transmit the audio signals of mobile phone Bluetooth, USB, AUX, and PC via FM, and then be received and listened to by a radio.**Decoding and Playback Function**: It can connect the audio signals of mobile phone Bluetooth, USB, AUX, and PC to an amplifier through a 3.5 - audio output port. Application Scenarios: In-car audio upgrades Home audio systems Computer external sound cards Outdoor music sharing Background music systems for commercial venues Notes: Only one device can be connected at a time. Before changing devices, disable Bluetooth on the original device. Japan frequency bands are not supported. Transmission distance varies depending on the environment. Bluetooth Features: Bluetooth Version: 5.3 (backwards compatible with 4.0/5.0) Receiver: FX180A or BT301 Transmitter: TX180A Supported Protocols: HFP/A2DP/AVRCP//GAVDP/IOP/SPP/BLE Transmission Range: Approximately 10 meters Special Features: Supports Bluetooth relay (receive and then transmit) Audio Playback: Supported Formats: MP3, WMA, WAV, FLAC Storage: Up to 128GB USB flash drive/TF card Memory function: Breakpoint memory, track memory Sampling rate: 8/11.025/12/16/22.05/24/32/44.1/48 kHz FM function: Transmitter mode: Frequency range: 76-108 MHz (global band) Transmitter power: 0.5W Transmitter distance: 200-500 meters (depending on the environment) Step accuracy: 0.1 MHz Stereo separation: >35 dB Receiver mode: Frequency range: 87.5-1 08MHz Search Mode: Automatic/Manual Memory: Station Memory Other Features: PC Sound Card: Driver-Free USB Sound Card AUX Input: 3.5mm Audio Input Audio Output: 3.5mm Line-Out Sound Effect Modes: 6 Selectable EQs (Normal/Rock/Jazz/Country//Classical) Power System: Battery Capacity: 2800mAh Li-Ion Battery Battery Life: >8 Hours Charging Port: Type-C Charging Rate: 5V/1-2A Color: Picture Color Material: PCB Package Contents: 1*Multi-functional FM radio 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.