2.4GHz digital FHSS technology improved interference resistance and smooth audio streaming. Super high S/N and 20 ~ 20 KHz full range hi-fi stereo sound quality. Extremely simple Plug-and-Play design; no installation required. Compatible with any earphones and active speakers, or stereo system. 360° omnidirectional transmission and reception for free-roaming of up to 30m radius. Compact and slim stylish design for comfortable use and easy to carry. Dual uses of wireless headphone and wireless headset for stereo audio and voice. Auto channel tracking. Built-in Li-ion rechargeable battery and charger for receiver. Built-in omnidirectional microphone in receiver. Compatible with Windows and Mac OS.