Features: Multifunctional car charging bluetooth-compatible receiver & USB input & FM transmission, double USB 3.1Amp fast charging. Full channel FM adjustment, strong FM signal, relatively without noise. With a knob to adjust level and frequency, simple to use. Supports USB drive, bluetooth-compatible, and comes with battery voltages detection, support up to 64GB. Small design, capable of 130 degree rotate, convenient for different vehicle models. Specifications: Color: Black Size: about 8x4x5cm/3.14x1.57x1.96inch Product Name: car bluetooth-compatible music player Product Model:HK201 Power supply: power USB output: total 3.1Amp Bluetooth-compatible frequency range: 2.4GHz-2.48GHz Bluetooth-compatible version: Bluetooth-compatible 4.2 FM frequency: support for FM transmission (87.5~108) fullbands Operating temperature: -10°~+50°C Suitable for car models: DC12V -24V car Package Includes: 1x Car FM Bluetooth-compatible Transmitter with Double USB Port note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.