RS SkySound - EN


Congratulations on the purchase of RS SkySound! We ask that you carefully read the following instruction manual and follow it when installing transmitter.

1. Installation

  • Plug the FM transmitter into your vehicles cigarette lighter or power port. The LED displays the voltage of your vehicle for 3 seconds.
  • The device enters Bluetooth pairing mode, while the display shows the Bluetooth and FM frequency.
  • Tune your vehicles radio to a local blank FM frequency, then match the transmitter to the frequency.
  • Enable Bluetooth on your mobile device and search for "T21".


  • Press the button once to play or pause
  • Rotate the button counter-clockwise to switch to the previous song.
  • Rotate the button clockwise to switch to the next song.

Listening to music via USB-Stick:

  • Tune your vehicles radio to a local blank FM frequency, then match the transmitter to the frequency.
  • Insert USB-Stick into the device, it will automatically detect and play MP3/WMA format music from the USB-Stick


After the device is successfully connected to your phone via Bluetooth you can make or answer calls:

  • Redial last number: Double-click the button.
  • Reject a call: Press and hold the button for 3 seconds.
  • Answer a call: Press the button once.
  • Hang up a call: Press the button once.


  • The transmitter enables charging your device via the USB port.
  • Connect the transmitter and your device using an appropriate charging cable (the output is 2.1A).

3. Troubleshooting

Please refer below for troubleshooting:

Problem 1.
There is too much noise when streaming.

Possible cause 1.
Adjust your vehicles radio and the fm transmitter to the local blank frequency of your city.

Problem 2.
Troubles setting the volume.

Possible cause 2.
Set the volume of your mobile device and the FM transmitter to the maximum and then regulate them with your vehicles radio.

4. Technical specifications

  • Bluetooth version: 3.0
  • Frequency range: 87.5 - 108.0 MHz
  • Output: 5V/2.1A
  • Working distance: 5m
  • Working current: 45mA
  • Stand-by current: 25mA

5. Safety notices

  • Product is compliant with the RoHS, WEE and CE directives.
  • The symbol on the side (crossed out trash bin) warns the product must not be disposed alongside other household waste, but should be disposed of at a collection center. The list of collection centers is provided to you by your public waste disposal service.
  • During charging the product may emit heat. While it may get warm it should never get too hot.
  • Keep the device away from sources of heat and direct sunlight exposure. If the devices starts to overheat, transfer it to a colder place and do not use it until it cools down.
  • Do not leave the device in places where the temperature may exceed 45°C.
  • When exposed to excessive temperatures, the lifetime of the device may be reduced.
  • If the product gets wet stop charging immediately and dry the product thoroughly.
  • Beware of excessive drops, dents, holes and deformations.
  • Do not open or repair the damaged product, as there is a risk of electric shock.
  • If uncertain how to proceed, please turn off the device and contact our support.

Additional safety informating for safe use and extending product life:

  • We advise you to use a ventilation slot holder in the hottest months, which will position the device away from the direct sun.
  • Do not leave the device while charging at places exposed to direct sunlight.
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