Bluetooth wireless earbuds support profile A2DP - Advanced Audio Distribution Profile. In-line controls include: volume up/down, play/pause/phone answering, and power/pairing. Features: built-in microphone, 20Hz - 20kHz frequency response, 32ohms nominal impedance, 96dB at 1KHz SPL sensitivity, LED pairing/power indicator, micro USB port for battery recharge, 33 Ft. wireless range, and built-in rechargeable lithium ion battery (2.5 Hr. play time). Includes: 3 sets of eartips - 1 small, 1 medium, 1 large, micro USB to USB cable, 90 day warranty, and user guide.