The Sennheiser HD 4.50 BTNC home/studio-style Bluetooth wireless noise-canceling headphones have a closed over-ear design. These headphones can be used with the noise-canceling feature turned on or off, are intended for use with Bluetooth enabled audio devices including cell phones as well as standard audio devices, and have a claimed wireless reception range of around 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 4.50 BTNC comes with a detachable 56-inch long standard audio cable for wired use, a USB charging cable, and a carrying pouch. 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.
Works with noise reduction off
Works with noise reduction offWill operate without the noise-canceling circuitry activated; allows the model to be used as standard headphones if the batteries die.
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 player control
Integrated player 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.
Detachable cableA detachable cable allows the headphones to be used for noise canceling without the cord being connected to a music or video player, or dangling from the headset.
Monitor functionHas a control that turns off the audio, and in the case of noise canceling models turns off the noise canceling function, so that ambient sounds can be heard. Useful for hearing ambience like travel announcements without turning off the audio player or removing the headphones.
Noise canceling unit in earpiece
Noise canceling unit in earpieceThe electronic circuitry for the noise cancelation function is integrated into headphones earpiece rather than incorporated as a separate module that is integrated into the audio cord.
Battery lifeAs claimed by the manufacturer.
19 (Bluetooth and NC)
Battery recharge time
Battery recharge timeAs claimed by the manufacturer.
Low battery indicator
Low battery indicatorAn indicator to show that the headphone battery power is low and will need to be replaced or recharged.
Warranty (mos.): parts/labor
Warranty (mos.): parts/laborWarranty is for parts and labor, in months.
Additional featuresAdditional features for this model.
2.4 GHz transmission frequency, Bluetooth wireless, around 33 ft. operating range. The Sennheiser Cap Tune smartphone app acts as a audio playback app, provides various types of tonal adjustments, and AirPlay (for Apple devices) and DLNA (for Android devices) audio streaming. NFC Bluetooth pairing. Bluetooth connected Apple mobile devices using iOS Version 5 and above will show the battery level. Detachable audio cable must be left connected for noise cancellation to operate when not in Bluetooth mode. Earcups fold for ease of storage.
Included accessoriesIndicates what accessories are included.
Detachable 56-inch long standard audio cable, USB charging cable, carrying pouch, free CapTune music player/equalizer app available for download to Apple or Android smartphones.
WeightReflects the weight, in ounces, of the headphones including the audio cable and batteries, if any.
Cable lengthCable length indicates the approximate length of the cable from the headset or earpiece to the plug, measured in inches.
Battery typeThe number and type of batteries used.