Features: brand new and high quality 1. Ring-shaped guide ring design, the guide ring lights up red when charging, and lights up blue after successful Bluetooth-compatible pairing, which is more intuitive to reduce customer complaints about Bluetooth-compatible pairing. 2. Add a voice button. When the user is in driving mode, press the voice button to easily activate the "Siri" intelligent voice. 3. The up/down button is designed on the side of the fuselage, which is convenient for users to control the up and down of Bluetooth-compatible music while driving. 4. Using the latest Bluetooth-compatible 5.0 chip, high-sensitivity microphone, CVC noise reduction technology, the transmission distance is longer, and the DSP signal processing technology makes the call clearer. 5. Built-in 300mA battery for longer battery life. 6. Increase the LCD display, the Bluetooth-compatible status, power, volume and other contents can be displayed intuitively. Specifications: Model: BT15 Pro Technologies: BT5.0 Chip Size: approx 5.5X3.5X1.3cm/2.16x1.38x0.51in Material:ABS Battery: Built In 300mA Package Includes: 1PC x Audio Receiver 1PC x User Manual note: There might be a bit color distortions due to different computer resolutions. There might be size errors due to different computer resolutions.