Includes Two Wireless Stereo Headphones with Swivel Flat Design and a wireless transmitter. Convenient Touch On/Off Switch + Volume Control and Extra Head Band Cushioning for extra comfort. Conerves Battery Power - Automatic Power Off when no signal is present. Power Input Tolerance: 40mm Mylar Cone, Impedance: 32 Ohms +/- 4Ohms, Automatic Mute (No-Noise Circuit Design)