Features: brand new and high quality Using Bluetooth-compatible 5.0 chip, with Led digital display, the working status is clearly visible; Multi-function,for Bluetooth-compatible reception & transmission, FM transmission, TF card playback, card reader, external sound card; Support AUX+FM dual output; FM transmission, adjustable frequency (87.5~108MHZ), stable signal, no noise and no interference; TF card reader function, which can copy data and other operations on the computer; Computer external sound card function; The effective transmission distance of Bluetooth-compatible 5.0 is 10 meters; Built-in high-quality decoding chip, high-definition stereo sound quality (support sound quality comparison of similar products); Specifications: Model: K9 Technologies: BT5.0 chip Support AUX+FM dual output;TF card playback Operation Range: Up to 10m / 33ft (without any blocking objects) Dimensions: approx 75x25x10mm/2.95x0.98x0.39in Color: White /Black Note: There might be a bit color distortions due to different computer resolutions. There might be size errors due to different computer resolutions. Package includes: 1PC x Audio Transmitter Receiver Adapter 1PC x User Manual