Sennheiser Freeport FP12 Wireless Headset System

The Sennheiser Freeport Wireless System offers a high quality UHF, multi channel wireless system at an incredible price. If you're not familiar with wireless jargon, here are the basics!
UHF stands for Ultra High Frequency - this refers to the type of radio wave that the wireless system transmits on. Older (& sometimes the new but very cheap) wireless systems are still using VHF (Very High Frequency) to transmit on, & these are the types of system that often interfere with local taxi firms & other shortwave radio users. UHF does not have this problem & provided that you're using a UK licenced frequency (which you will be with a Freeport system) the only interference that is possible is from another UHF wireless system that uses the same frequency (ie - another member of your band!).

Multi Channel means that the wireless system can be switched to work on different frequencies. The Sennhieser Freeport system has 4 frequencies (or channels) to chose from - all of which are UK approved to be used without a licence. This means you can run 4 Freeport systems simultaneously in the same band - you just each select a unique frequency. If you need more than 4 wireless systmes then you'll need to buy a more expensive system with more frequencies to chose from (like the Sennheiser Evolution Systems).
In summary, the Freeport system operates on UHF which means virtually no chance of interference, & it has 4 channels to choose from, which means up to 4 people can use Freeport systems in the same band.

The headset system is the same as the presenter system, but comes with a light weight, high quality headset mic as well as the lapel mic. This is ideal for singers/dancers who want to move around a lot, or for teachers or people doing business presentations. Because the headset mic is much closer to the mouth then the lapel mic, the headset system is much more suitable for singing.

Here's what Sennheiser say about the Freeport FP12 Wireless Headset System

The Freeport Headset system ensures high quality hands free performance for singers, dancers, musicians & aerobics teachers.

Features
4 switchable UHF frequencies for interference-free reception
Absolutely safe transmission
Diversity Technology for highest reception quality
Adjustable Squelch for undisturbed operation
Receivers built in robust metal housing
Dynamic processor for cristal-clear sound 
10 hours operating time on a single PP3 battery

Includes
1 bodypack transmitter SK 2
1 Headset Microphone
1 clip-on microphone ME 2-2
1 diversity receiver EM 1
1 power supply
1 user manual