Blurex Digital Wireless Headphones with Charging Dock (2.4 Ghz) Manufacturer Refurbished REFURBISHED--This Product has been tested to be 100% Functional --Digital 2.4 Ghz Wireless Headphone for crystal clear sound with virtually no static Phase-Lock Loop (PLL) technology locks in frequency to prevent signal loss Automatic battery recharging on supplied docking station Connects to the audio source via any standard 3.5mm audio jack, no installation required!!! 100 foot range - High quality sound and is virtually interference free from other wireless devices