Compatibility: For smartphones, tablets, laptops. Not for desktop phones (unless Bluetooth® capable). Unidirectional noise canceling microphone. LED indicator ring on the headset shows others when you're on a call. ZuM BT Prestige™ charges when docked in base or you can plug your headset into any USB charging source using the supplied micro-USB cable. Listen to music from your paired device when you're not on a call. Talk time: 10 hours from 3.7V, 300mAh battery. Stand by time: 240 hours.