DESC: Pump up the volume and groove about your listening room as you enjoy music or TV soundtracks with Sony's MDR-IF540K Wireless Headphone System. This complete kit that includes a transmitter and headphones offers features like a Lightweight, open-air design, 30 mm drive units for deep bass, Automatic On/Off, and a Vibration Function (with level volume) for an exciting game and movie experience. Also utilize the Two Audio Inputs to accommodate audio and video sources, the Rechargeable Battery, Up to 45 Hours of Battery Life (optional alkaline battery), a Transmission Range up to 24 feet, and a Transmission Coverage angle up to 90°. The MDR-IF540K enables an easy connection to your home audio system, TV, PC or VCR. Hear the difference.