1. Frequency response: 50Hz-20KHz 2. Directionality: omnidirectional 3. Plug: 3.5mm (nickel plated, gold plated) 4. Wire diameter: 2.5mm/2 core shielded wire 5. Application: loudspeaker/wireless microphone host, etc. (stage performances, podium lectures, lectures, also suitable for meetings, web chats) 6. Small and easy to carry 7. Can be clipped on the neckline, flap, undershirt 8. Line length: 3 meters 9. Microphone size: 9.7x6.7mm

http://olla.gr/zj002mr-mono-3.5mm-straight-plug-car-sun-visor-wireless-interpreter-tour-guide-megaphone-lavalier-wired-microphone-length-3m/