Ch 70

Trantec S4.04-BTX wireless beltpack

£99.95 £119.94 incl. VAT

UHF Ch 70 bodyworn radio microphone transmitter

In stock




Trantec S4.04-BTX UHF wireless beltpack transmitter

For use with S4.04 and S4.4 wireless microphone receivers only

Pocket transmitter, which may be clipped to clothing with its belt-clip, operates on four pre-programmed UHF license free frequencies. The plastic body has a sliding panel which reveals a battery compartment, controls to set frequency, gain and select either microphone or guitar input. On the top there is an on/off switch and power/battery LED. A screw-in antenna and a 3.5mm input jack with screw-locking facility are also situated on the top of the beltpack transmitter

CH 0 – 863.150MHz
CH 1 – 863.725MHz
CH 2 – 864.150MHz
CH 3 – 864.850MHz

All of these frequencies are on Ch 70 and are license-free in the UK

Legacy Trantec compatibility information: S4.04 transmitters can be used with S4.4 receivers (S4.4 transmitters cannot however be used with S4.04 receivers)

  • New S4.04 transmitter on channel 0 will work with old S4.4 receiver on channel 1
  • New S4.04 transmitter on channel 1 will work with old S4.4 receiver on channel 2
  • New S4.04 transmitter on channel 2 will work with old S4.4 receiver on channel 3
  • New S4.04 transmitter on channel 3 will work with old S4.4 receiver on channel 4
  • Supplied without microphone – suitable microphones include LP2 clothing clip mic and HSE-80SX headworn mic
  • Audio frequency response: 50Hz-15kHz
  • Power output: 10mW maximum
  • Operating time: 10 hours approximately using an alkaline battery
  • Power source: AA 1.5V battery
  • Dimensions: 62 x 100 x 25 (w x h x d)mm, including belt clip
  • Weight: 85g with battery
  • Included accessories: Instructions, antenna



For nearly thirty years Trantec have specialised in producing high quality wireless microphones, beltpacks and in ear monitors. Our wide product range, as well as versatile accessories, ensures that we can cater for the most challenging audio demands, at almost any budget within the broadcast, film, music, school, house of worship and theatre industries. Now owned by TOA, Trantec continues to advance by investing in our own research and development to ensure that our product range maintains its innovative, market leading position. For over a quarter of a century TOA has been committed to developing vocal and speech radio products to the highest specification at the cutting edge of technology. We are proud to have become synonymous with high quality and reliability. The introduction of the latest Trantec wireless microphones has completed the TOA line up that allows integration into a wide and varied market sector that makes challenging demands within professional audio, broadcast, film, music and theatre.

Additional information

Frequency Band


Wireless Microphone Channel

Channel 70 (863-865 MHz)


Locking 3.5mm Jack (Internal Thread)





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