Retekess FT11 0.3W Portable FM Transmitter,Mini Radio Stereo Station,Support TF Card and AUX Input,2000mAh Rechargeable FM Broadcast Transmitter for Drive-in Church School Tour Guide Home Outdoor

* Pocket design but powerful; 3.9 x 2.2 x 0.6 in size and 0.17lb weight; easy to carry; it reaches the maximum transmission distance of 200 meters * Long working time; the radio transmitter are equipped with built-in 2000mAh polymer lithium battery and supplied with high performance; the USB cable with the bold copper core support faster charging speed * Clear sound quality; this radio transmitter has a clear sound quality and high sensitivity due to its digital audio processing; anti-howling effect; built-in condenser microphone; support for external condenser microphone * MP3 and music player; support TF card and AUX line-in to play music with the 3.5mm male to male Aux cable; so the radio transmitter can play music of your phone to the fm receiver * Expandable and DIY; you can transmit across the entire public FM band; 1 transmitter can pair up to countless fm receivers; if you have more than one tour guide or simultaneous interpreting area you would like to add; just DIY and fulfill your needs