The Pilot PA200T offers super clear safety enhancing cell phone communications through your headset. The PA-200T has a built in amplifier to boost your cell phone conversations. The PA-200T is also a back up intercom if needed and has music and voice mute for ATC overrides. You can also play a CD, MP3 or Ipod player through the PA-200T. The PA-200T is powered with one 9 Volt battery. The PA-200T comes complete with cell phone connection cord. Nokia phones will need an adapter which can be purchased at any electronics store selling cell phones. Size: 3"X2"1".