Features: Bluetooth-compatible version 5.0 supports bluetooth-compatible audio playback and hands-free calling. High-resolution, high-performance stereo music playback. Multiple protections such as over-current, over-charge, over-temperature, over-voltage,short-circuit protections, and anti-combustion make it safer to use. Small and exquisite, easy to use. Support dual displays digital tube, real-time detection and display of battery voltage. brand new and high quality Specifications: Material:ABS Working voltage: 12V-24V USB port: QC3.0 (max18W) Type-C port: PD3.0 (max18W) Battery voltage error: ± 0.5V Bluetooth-compatible version:5.0 FM transmit frequency: 87.5-108Mhz Bluetooth-compatible sound processing: A2DP DSP+A2DP Size:Approx.70x45x20mm/2.75x1.77x0.78inches Cable Length:Approx.118cm/46.45inches Package Includes: 1x Car Transmitter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.