Sennheiser D10 USB ML Wireless DECT headset (monaural) with base station

Specification :

• Frequency response (microphone) - Wideband: 150 Hz – 6.8 KHz 
• Frequency response (microphone) - Narrowband: 300 Hz – 3.5 KHz 
• Frequency response (headphones) - Wideband: 150 Hz – 6.8 KHz
• Frequency response (headphones) - Narrowband: 300 Hz – 3.5 KHz
• Weight - ear hook version: 22 g / 0.78 oz
• Weight - headband version: 50 g /1.76 oz 
• Earpad size - ø 50 mm / 1.96 in 
• Charging time - 0 - 50: 20 minutes
• Charging time - 0 - 100: 1 hour 
• Standby time - Up to 100 Hours 
• Range - line of sight: 180 m / 590 ft
• Range - in typical office building: 55 m / 180 ft 
• Talk time - Wideband: Up to 8 hours 
• Talk time - Narrowband: Up to 12 hours 
• Storage temperature -20 °C to + 70 °C (-4 °F to +158 °F) 
• Operating temperature +5 °C to + 45 °C (+41 °F to +113 °F)