The ATH-SR5BT Wireless on-ear headphones give you phenomenal Hi-Res Audio with the convenience of Bluetooth wireless technology operation. Up to eight devices (smartphones, tablets, music players, etc.) can be stored in the memory of the ATH-SR5BT for quick connection to your chosen devices. And adding or replacing devices is made even easier with the headphones’ NFC (Near Field Communication) functionality: just touch any NFC-compatible device with Bluetooth wireless technology to the N-Mark on the headphones and the device and headphones are automatically paired and connected. The ATH-SR5BT features powerful 45 mm drivers and comes equipped with a mic and volume/control switch built into the left earcup, making it easy to answer calls, adjust volume and handle playback (play, pause, fast-forward, reverse, next/previous track) of music and video on compatible smartphones and other portable devices. A smartphone cable with mic and controls is also here to provide a standard wired connection in areas where use of Bluetooth wireless technology is prohibited, for when battery power is low, or when Hi-Res Audio (5 – 40,000 Hz frequency response) is desired. Product Type: Headphones - wireless - Bluetooth - NFC Recommended Use: Portable electronics, phone Color: Black Headphones Form Factor: On-ear Connectivity Technology: Wireless - Bluetooth Bluetooth Version: Bluetooth 4.1 Sound Output Mode: Stereo Audio Specifications: Frequency Response 5 - 40000 Hz - Sensitivity 100 dB/mW Impedance: 35 Ohm Max Input Power: 1500 mW Microphone Technology: Condenser Controls: Volume, answer/end, play/pause, next/previous track Manufacturer Warranty: 2 years warranty Product Type: Headphones - Bluetooth - NFC Weight: 6.52 oz Color: Black Earpad Material: Memory foam Recommended Use: Portable electronics, phone Headphones Form Factor: Supraaural Headphones Cup Type: Closed Connectivity Technology: Wireless - Bluetooth Available Microphone: Yes Bluetooth Version: Bluetooth 4.1 Bluetooth Profiles: Hands Free Profile (HFP), Headset Profile (HSP), Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP), Low Complexity Subband Coding (SBC) Sound Output Mode: Stereo Frequency Response: 5 - 40000 Hz Max Input Power: 1500 mW Sensitivity: 100 dB/mW Impedance: 35 Ohm Diaphragm: 1.8 in In-Cord Volume Control: Yes Form Factor: Built-in Microphone Technology: Condenser Sensitivity: -44 dB Frequency Response: 50 - 4000 Hz Audio Input Details: Omni-directional - 50 - 4000 Hz Controls: Volume, answer/end, play/pause, next/previous track Transmission Range: 33 ft Connector Type: Headphones ( mini-phone stereo 3.5 mm 4-pole ) Detachable Cable: Yes Cable Length: 4 ft Cables Included: Headphones cable - detachable - L shaped - 4 ft USB charge cable - 3.3 ft Included Accessories: Carrying pouch Battery: Headphone battery rechargeable - lithium polymer Run Time (Up To): 38 hour(s) Standby Time: 1000 hours Recharge Time: 4 hour(s) Service & Support: Limited warranty - 2 years