Headband headphones wireless headphones series sennheiser rs line type of fitting over ear transmission mode cordless features padded headband touch panel function fast charging function sound functions bass boost passive noise reduction range 30 m button position on headphones sensitivity 106 dbmw frequency response 18 21000 hz number of drivers 1 operating time 18 h jacks 35 mm digital optical colour black weight 300 g included in delive