DC 12/24V Bluetooth Version 5.0 FM Transmitter Car Player Kit Card Car Charger Quick With QC3.0 Dual USB Voltmeter & AUX IN/OUT Features: 1. Low noise: It has noise cancellation function, built-in noise cancellation circuit, makes the voice more clear. 2. Display screen: The display screen can show the frequency. Frequency is clear. 3. Convenience: The car radio frequency and wireless MP3 frequency can be adjusted to play disc songs in unison. 4. Dual USB: Dual USB ports can be charged at the same time, up to 3.1A, and mobile phones and tablets can be charged at the same time. 5. High-quality chips: This product uses a new generation of chips for rapid response, constant temperature and steady current charging, no harm, making charging safer. Description: This product adopts full frequency FM wireless transmission technology, which can directly read the audio files from the mobile phone"'"s wireless/ TF card / U disk.Specifications: Size: 36*34*47mm Input current: 3.1A (dual USB smart current) Transmission efficiency: 87.5108MHZ Wireless version: Wireless 5.0 Launch distance: <5 meters Working voltage: 12V-24V Display screen: wireless digital display Effective distance: about 10.5 meters Support expansion: U disk 32G Package Included: 1 pcs *Car Player Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.