The JTS-HHS2 system features the exclusive JTS Remo set system the world"s first remote control RF setting system that allows automatic remote control frequency setting from the receiver! Simply scan for a free channel, push the Remo set button and you are ready to go! The transmitter belt pack is powered by 2 x AA batteries with 12 hrs. average battery life. The JTS-LVS2 system comes with the JTS CM-204 Cardioid condenser vocal headset microphone provides high quality vocal pick-up, plus a wide dynamic range and smooth frequency response for great sound and above average gain before feedback! It"s small size makes it virtually disappear on the person wearing it. The IN-264 belt pack transmitter connects to the microphone by way of a 4 Pin Mini XLR connector, it features a heavy duty plastic case with an easy to read LCD display that displays RF level, audio level, channel, battery life , and channel number. The JTS IN-264 lock on function prevents tampering and RF interruption. Additional features include noise mute and tone-key squelch to prevent noise when transmitter is switched off. Compatible with any JTS wireless instrument or headset microphone. I whole lot of wireless features for not a lot of money!