Logitech ZONE VIBE 100 Lightweight Wireless Headphones (981-001219) – Microphone Type: Dual omni-directional MEMS mics with directional beamforming and DSP Frequency Response: 100 ~ 8 KHz, Speaker Frequency response (music mode): 20 ~ 20 KHz, Frequency response (talk mode): 100 ~ 8 KHz, Sensitivity: 118.0±3 dB at 1mW @1 kHz, Driver size: 40 mm, Battery: Built-in battery (Lithium ion), Battery life (talk time): Up to 18 hrs, Battery life (listening time): Up to 20 hrs, Bluetooth version: 5.2. Wireless range: Up to 30 m (open field line of sight), Colour: Off White