POLY

Headphones Noise reduction: Yes Headphone sensitivity: 90 dB Impedance: 32 ? Driver unit: 2.8 cm Microphone Microphone direction type: Omnidirectional Microphone frequency: 100 - 10000 Hz Microphone type: Boom Microphone sensitivity: -38 dB Packaging

Battery Battery type: Built-in battery Battery technology: Lithium-Ion (Li-Ion) Headphones Headphone frequency: 20 - 20000 Hz Driver unit: 3.2 cm Microphone Number of microphones: 4 Microphone frequency: 100 - 6800 Hz Microphone type: Boom Packaging

Battery Battery technology: Lithium-Ion (Li-Ion) Standby time: 50 h Battery type: Built-in battery Talk time: 24 h Battery operated: Yes Charging source: USB Continuous audio playback time: 47 h Battery recharge time: 1.6 h Headphones Driver unit: 3.