Samson Airline AR1 'Plug-On' Wireless Microphone System.
 
Turn any dynamic microphone into a wireless with this 'plug-on' UHF wireless system.
Another product that falls into the 'why did they stop making them?' category.
The transmitter is about the size of a standard XLR plug. Just plug into your favourite microphone and you're wireless.
Analogue UHF so no latency/delay of digital systems.
I owned about four of these at one point and they were great. Super-reliable, never let me down.
Other manufacturers attempted this, but the plug on transmitters were always too big. The Sennheiser one is/was a huge lump!
Nobody managed to get it down to this size.
Great for hire live sound/AV pros and hire companies. You could offer your clients a wireless version of any of your microphone inventory.
PLEASE NOTE: Doesn't work with condenser microphone, it won't power them!
All accessories included including power supply, user manual, and foam lined ABS case.
I've thrown in a Pulse microphone which is actually a pretty good sounding dynamic mic if you want to use it as a wireless microphone straight out of the box.
- Diversity receiver with RF signal and audio signal meters.
- XLR of jack output.
- Mic or line output level switch.
- Quick/easy battery compartment. Single AAA battery.
Any questions, feel free to message. 
Price includes UK shipping via 2/3 working day courier.