The Sennheiser HD 4.40BT home/studio-style Bluetooth wireless headphones have a closed over-ear design. These headphones are intended for use with Bluetooth enabled audio devices including cell phones as well as cable connected audio devices, and have a wireless reception range of about 33 feet. The headphones have a built-in microphone and integrated volume, music player function, and call connect/disconnect Bluetooth controls. Additional features include NFC Bluetooth pairing and earcups that fold for ease of storage. The HD 4.40BT comes with a detachable 56-inch long standard audio cable for wired use, a USB charging cable, and a carrying bag. It is covered by a 24-month warranty.
Plug typeThe type of connection at the end of the audio cord, which will be plugged into the source component. Most have 1/8-inch standard (3-contact) "mini" jacks that fit portable devices. Models intended for use with newer iPod, iPhone, and some Blackberry smartphones, that have integrated microphones, audio player controls, and call connect/disconnect controls use a 1/8-inch 4-conductor mini jack. The audio function of models with 4-conductor mini jacks may not work properly or consistently with non-iPod/iPhone devices.
Integrated microphoneHas an integrated microphone for use with some cell phones or audio players with a recorder function.
Call connect/disconnect control
Call connect/disconnect controlThis allows you to answer or disconnect from a phone call with some cell phones.
Integrated volume control
Integrated volume controlThis allows you to adjust the volume without having to dig into your pocket or purse for a player.
Integrated function control
Integrated function controlThis allows you to control some player functions (for example: play, pause, track skip) via a control without having to dig into a pocket or purse for a player.
Warranty: parts, labor
Warranty: parts, laborWarranty (parts/labor, mo.) indicates the length of the manufacturer's warranty for parts and labor, in months.
Additional featuresAdditional features for this model.
2.4 GHz transmission frequency, Bluetooth wireless, around 33 ft. operating range. Operates up to 25 hrs. on built-in rechargeable Lithium-ion polymer batteries with a charge time of 3 hrs. Has low battery indicator and battery recharge indicator. NFC Bluetooth pairing. Bluetooth connected Apple mobile devices using iOS Version 5 and above will show the battery level. Has cord connection option for use with standard audio devices. When cord connected can provide audio even when not turned on. Detachable audio cable. Earcups fold for ease of storage. The Sennheiser Cap Tune smartphone app acts as a audio player app, provides various types of tonal adjustments, and AirPlay (for Apple devices) and DLNA (for Android devices) audio streaming.
Included accessoriesIndicates what additional accessories are included.
Detachable 56-inch long standard audio cable for wired use, USB charging cable, carrying bag, free CapTune music player/equalizer app available for download to Apple or Android smartphones.
Cord lengthCord lengths indicates the approximate length of the cord from the headset or earpiece to the plug, measured in inches.
WeightReflects the weight, in ounces, of the headphones including the audio cable and batteries, if any.