Samson Wireless XPD2-PRES USB Digital Wireless Mic System w/ LavalierIt doesn't get much any more wireless than the Stage XPD2 Presentation set by Samson. It's a completely wireless lavalier set for hands free audio streaming. Plug in the ultra small USB stick receiver in your computer or Samson Expedition speaker and you're good to go. With an OTG adapter or Camera Connection Kit (sold separately), you can use this system with an iOS or Android device. Product features Battery type AA Battery life (approx.) 16 20