Enjoy total wireless freedom to take a phone call in the midst of working and listening to music when you wear these versatile Sennheiser MM 400 Bluetooth Wireless Headphones. Effortless design Offering full, high-quality Sennheiser sound with closed acoustic design, this lightweight wireless headset weighs only 105g, yet delivers a wide dynamic range with natural, detailed audio reproduction. With convenient headset controls and an invisible microphone, you can use the MM 400 to conduct hands-free phone calls with ease and clarity. Power it up Rechargeable through a USB connector which is supplied or wall adaptor, these superb headphones offer a 10-metre range, 10 hour listening time, and up to 20 hours of talk time. With a secure, soft cushioned fit that you can wear all day, the MM 400 Bluetooth Wireless Headphones will keep you free from wires and allow you to work seamlessly through your day! Characteristics Headphone Type On-ear headband Headphone Style Travel, iPod, iPhone & Mobile Colour Black Foldable Yes Adjustable Yes Earcups On-ear Acoustic System Closed Jack Type & Style 3.5mm Weight 104g Bluetooth Yes Wireless Yes - Bluetooth 2.1 EDR Bluetooth/Wireless Range 10m Passive Noise Isolating Yes In-Line Microphone Yes In-Line Volume Control Yes Frequency Response 100 - 10,000 Hz Sensitivity 107 dB Requires Batteries Yes - rechargeable via USB in 3 hours Other Features Compatible with latest generation of tablets Accessories Included Audio cable with in-flight adapter (3.5mm double mono adapter) USB cable Wall charging adapter Carrying case Manufacturer Guarantee 2-year international warranty