Why Choose ToHayie Bluetooth FM Transmitter? 1. Best music lossless transfer in the market. ToHayie Bluetooth FM Transmitter achieve the stereo music lossless transfer to your car speaker, to grant most crystal sound quality. Please be noted, due to radio frequency interference and car ground loop noise, it is almost impossible for any transmitter to produce a perfect audio, but ToHayie does one of the best work in the market. 2. Super Clear Large Screen. The 1.4 inches large screen will show incoming call number, , volume, FM frequency and song name if you play music from TF card or USB flash disk. 3. Charge Your Devices Easily With a 5V/1.1A USB charging port, you can charge your phone or other devices in fast speed. 4. Remote Contol & Music Playing Support with 21-key remote control for the FM Transmitter, everyone in car can control music playing or calls freely. 5. Hands Free & Safely Drive Built-in microphone feature can set free your hands during answer the calls and help you safely drive. Specifications: Bluetooth Version: Version 4.1 Frequency: 20Hz-15Khz USB Charging Port Output: 5V/2.1A Support File Format: WAV, MP3, WMA Voltage: 5 V + / - 0.5Litmied voltage: 9-26V Effective Range: 10meters Transmit Frequency: 87.5-108MHzNoteThis transmitter has power switch, you need turn on the power swith before you use it.About ToHayie