The RS 140 is a closed, circumaural RF wireless headphone system, equipped with balance control and switchable compression for better speech intelligibility. The headphones are able to play loud, so they are ideal if a bit of extra volume is needed, while their closed design prevents sound leakage. The Sennheiser system is extremely user-friendly due to its easy-recharge function and intelligent auto-tuning. Acoustic and visual signals confirm the adjustment of new settings. An innovative, self-learning automatic level control ensures that the headphones always reproduce an optimum audio level. The RS 140 wireless system features an excellent sound image with outstanding bass response, making it an ideal choice for all types of music and TV use.