Audio-Technica M50XBT2 MO Bluetooth Headphones - Black - Type: Closed-back dynamic - Driver Diameter: 45mm - Frequency Response: 15–28,000Hz - Sensitivity: 99 dB/mW - Impedance: 38ohms - Battery: DC 3.7V lithium polymer, approx 50 hours continuous use - Omnidirectional Microphone Type: MEMS - Microphone Sensitivity: -38 dB (1V/Pa at 1kHz) - Microphone Frequency Response: 85 -15,000Hz - ATH-M50xBT2 - 12 Months Limited Warranty - Open Box

Manufacturer Warranty: 12 Months Limited Warranty

Manufacturer Contact Info: http://audio-technica.com.au/, (02)9519-0900