Blurex Wireless Headphones With Charging Dock(900mhz) BLX-WS1756 900mhz Wireless Headphone Phase-Lock Loop (PLL) technology locks in frequency to prevent signal loss 165 foot range - High quality sound and is virtually interference free Automatic battery recharging on supplied docking station Connects to the audio source via any standard 3.5mm audio jack, no installation required!!!