How to operate RETEKESS TR504 FM Transmitter?

Aluminum alloy metal shell, good heat dissipation Transmission frequency can be set from within the range of 76-108MHz 1W/6W low-high power adjustable, transmission distance of 1-2km ( mi) in the open air Audio input volume and microphone volume can be adjusted separately Channel switching: switchable stereo, mono scenes to be used:Campus radio, supermarkets, churches, farms, factories notice, education and training, scenic broadcasting, corporate meetings, automobile cinema, outdoor team contact (received through the car FM radio) or create your own radio station. TR501: Retekess official contact information: retekess Official Store: RETEKESS EUROPEAN Store: Retekess RU: Email: ali-express@ WhatsApp: 86 15638550861 Facebook: Facebook: