Characteristics and Interoperability 50mm driver size; 111+-3dB speaker sensitivity Regularity Reaction: 20–20 kHz Impedance: 32+-15% Microphone Attenuation: -42+-3dB Microphone Omni-Directional Microphone for Directivity Maximum impedance of 2.2K ohms Micropgone Size: 4.0 x 1.5 mm; Bluetooth Range: 30 meters Wireless Range of 2.4G: 15m Connectivity: 3.5mm TRRS connector; 41 hours of battery life