Closed-back headphones with radio frequency and volume control. The wireless system allows you to listen to programs and music without the hassle of cables, providing complete freedom of movement. The signal has a maximum wireless range of 100 meters in open space. Quick connection to TV, decoder, DVD, Blu-ray, and other analog audio sources via analog audio cable (3.5mm jack). Compact transmitter base can be hidden behind the TV and is powered via USB. The headphones feature a built-in lithium polymer battery, charging quickly via USB cable (2 hours for a full charge) with about 8 hours of continuous use on a single charge. Volume control function is available on the headphones. The adjustable headband ensures an ideal fit for prolonged use. Ergonomic and comfortable, the ear cups perfectly adapt to the shape of the ear. Automatic frequency synchronization between the headphones and the transmitter base (Auto Tuning) and automatic shut-off of the headphones in the absence of signal. Two transmission channels are available to avoid interference. The headphones can also be used as a regular wired headset.