Solo Microphone EX, tabletop boundary, omni-directional. It features RF-Armor, allowing it to be used in direct contact with all wireless electronic devices known to cause unwanted audio interference (radio frequency interference).\ High quality wideband audio for exceptional voice reproduction in a very small form factor. The Solo RF-Armor Tabletop Wireless Microphones have exceptionally robust shielding which enables the microphone to operate cleanly even when in direct contact with all wireless electronic devices known to cause unwanted audio interference, such as GSM mobile phones, smart phones, etc. Requires Revolabs Executive™, Solo™, or Fusion™ system. Available in omni-directional and uni-directional microphone patterns. Eight hours of continuous use on a single charge. Recharges in two hours, or add the AC adapter accessory, eliminating the need to return the unit to a charger.