Wireless headset stereo pc headset design on ear transmission modes wireless bluetooth radio radio range 10 m operating time 8 h standby 270 h charging time 25 h sound mode 10 hardware type of headphones headband features onoff switch control via headset volume control adjustable headband led indicator headphone transmission range 20 20000 hz microphone properties rotating microphone earcup material foam weight 42 g included in delivery us