Revolabs 01-HDTBLMIC-DR-11 RF-Armor Directional Tabletop HD Microphone, Mute Button for Muting and Pairing, LED Display for Muting and Pairing, Audio Out Port, Power/Charging Port Perfect for applications ranging from audio and video conferencing in small conference rooms to voice amplification in large auditoriums, Revolabs tabletop directional microphones are specifically designed to pick up the speech of one to three people directly in front of the microphone. Key Features* Mute Button for muting and pairing * LED Display for muting and pairing * Audio Out port– 2.5 mm unbalanced * Power/Charging Port–Requires Revolabs HD Charger Base Specifications* Audio Bandwidth: 50-20,000 Hz * Radio Frequency: 1.92 to 1.93 GHz * Encryption: 128-bit proprietary (per microphone channel) * Lithium Polymer Battery: Up to 8 hours of talk time * Charge Time: 2 hours * Dimensions: 3.54" x 1.0" x 0.69" * Weight: 0.07 lb