Features: Bluetooth 5.0/Hands-free call/Voice Navigation. Support TF card playback (TF card needs to purchase by yourself) Audio Format Support MP3,WMA,APE,FLAC,WAV After turning on the phone, it automatically connects to the mobile phone's Bluetooth, which can make hands-free calls/navigation voice broadcasts and safty driving. Automatically reconnects at startup,memorizes frequency,songs restart after power off, The song started playing from the beginning when the power off. Stable connection., Reduce signal interference, Smooth playback, Clear caling S-23/S-25 Specifications: Product size: 46*46*13.5mm Bluetooth version: 5.0. Signal-to-noise ratio: 75db Bluetooth distance: Barrier-free 10 meters Frequency Response: 50Hz-20KHz Output interface: 3.5MM AUX OUT NIC sensitivity: -42db Support 5V/0.1A USB power supply Spring wire: support USB 5V100MA power supply S-1 Specifications: Rated working voltage: 12V-24V Supported music formats: MP3/WMA Support TF card capacity: 1G-32G Working temperature: 0-60 Signal-to-noise ratio:>60dB Distortion: 60dB Bluetooth-compatible version: Version5.0+EDR Bluetooth-compatible sound processing: A2DP (Advance Audio Distribution Profile) function Bluetooth-compatible transmission distance: less than 10M Colour: Black Note: 1. Due to manual measurement, please allow 1-3cm error. Make sure you don't mind before bidding. 2. Due to the difference of different monitors, the picture may not reflect the actual color of the product. Thanks. Package List: 1x Car bluetooth transmitter Packed safely in Retail box.