Long wear comfort lets you listen to endless music via bluetooth or aux in and a built-in microphone lets you easily make and receive phone calls. features: bluetooth wireless supports profile a2dp (advanced audio distribution profile) rubberized coating built-in microphone aux in (3.5mm audio input) micro-usb port for battery recharge driver: 40mm frequency response: 20hz – 20khz nominal impedance: 32ohms sensitivity: 102db at 1khz spl wireless range: 33 feet on-ear controls: volume up, volume down, play/pause, pairing/phone answering/power voice prompts led pairing indicator led power indicator dc battery power: built-in rechargeable lithium polymer battery battery life: ~5 hours