Logitech Zone Wireless Bluetooth NC Stereo Headset - Microsoft- Zone Wireless USB Reciever - Omni-Directional Dual MEMs Microphone (Frequency Response: 85 ~ 20kHz - Speakers Frequency Response: 30~13kHz @ -10dB (Music) 100~8kHz per TIA920 (Talk Mode) - Built-In Battery (Lithium Ion) - Battery Life: Up to 16 Hours (Listening ANC Off) Up to 15 Hours (Talk ANC Off) - Includes Travel Bag - 981-000855 - 2 Years Limited Limited Warranty - Open Box

Manufacturer Warranty: 12 Months Limited Warranty

Manufacturer Contact Info: http://www.logitech.com, 1800 025 544