![]() ![]() Some stereo earbuds are wireless, using Bluetooth connectivity to transmit the audio signal by radio waves from source devices like cellphones and digital players. Headphones that use cables typically have either a 1⁄ 4 inch (6.4 mm) or 1⁄ 8 inch (3.2 mm) phone jack for plugging the headphones into the audio source. Headsets designed for telephone use typically cannot reproduce sound with the high fidelity of expensive units designed for music listening by audiophiles. Headphones exhibit a range of different audio reproduction quality capabilities. Initially the audio quality was mediocre and a step forward was the invention of high fidelity headphones. The first headphones were developed in the late 19th century for use by telephone operators, to keep their hands free. Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio. In the context of telecommunication, a headset is a combination of headphone and microphone. A third type are bone conduction headphones, which typically wrap around the back of the head and rest in front of the ear canal, leaving the ear canal open. Another type, known as earbuds or earpieces consist of individual units that plug into the user's ear canal. Circumaural ('around the ear') and supra-aural ('over the ear') headphones use a band over the top of the head to hold the speakers in place. Headphones are also known as earphones or, colloquially, cans. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby to hear. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Dell and the Dell logo are trademarks of Dell Inc.Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. Your Minimum Payment Due is the greater of either $20 or 3% of the New Balance shown on your billing statement (excluding any balance on a Planned Payment Purchase prior to its expiration date) rounded up to the next dollar, plus any Monthly Planned Payment Due, plus the sum of all past due amounts. Taxes, shipping, and other charges are extra and vary. residents by WebBank, who determines qualifications for and terms of credit. ![]() ^DELL PREFERRED ACCOUNT (DPA): Offered to U.S. $50 bonus rewards typically issued within 30 business days after DPA or DBC open date. ![]() $50 in bonus rewards for Dell Rewards Members who open a new Dell Preferred Account (DPA), or Dell Business Credit (DBC) account on or after. Offers and rewards subject to change without notice, not combinable with all other offers. Not valid for resellers and/or online auctions. Expedited Delivery not available on certain TVs, monitors, batteries and adapters, and is available in Continental (except Alaska) U.S. Outlet purchases do not qualify for rewards. ![]() Total rewards earned may not exceed $2,000 within a 3-month period. Check My Account for your most up-to-date reward balance. “Current rewards balance” amount may not reflect the most recent transactions. Rewards expire in 90 days (except where prohibited by law). Rewards are issued to your online Dell Rewards Account (available via your My Account) typically within 30 business days after your order’s ship date. *Rewards 3% back excludes taxes and shipping. Ultrabook, Celeron, Celeron Inside, Core Inside, Intel, Intel Logo, Intel Atom, Intel Atom Inside, Intel Core, Intel Inside, Intel Inside Logo, Intel vPro, Itanium, Itanium Inside, Pentium, Pentium Inside, vPro Inside, Xeon, Xeon Phi, Xeon Inside, and Intel Optane are trademarks of Intel Corporation or its subsidiaries in the U.S. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |