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  2. Cordless telephone - Wikipedia

    en.wikipedia.org/wiki/Cordless_telephone

    Some cordless phones formerly advertised as 5.8 GHz actually transmit from base to phone on 5.8 GHz and transmit from phone to base on 2.4 GHz or 900 MHz, to conserve battery life. The 1.9 GHz band is used by the DECT 6.0 phone standard and is considered more secure than the other shared frequencies.

  3. List of UN numbers 3401 to 3500 - Wikipedia

    en.wikipedia.org/wiki/List_of_UN_numbers_3401_to...

    Lithium-ion batteries (including lithium-ion polymer batteries) UN 3481: 9: Lithium-ion batteries contained in equipment or lithium-ion batteries packed with equipment (including lithium-ion polymer batteries) UN 3482: 4.3: Alkali metal dispersion, flammable or alkaline earth metal dispersion, flammable UN 3483: 6.1: Motor fuel anti-knock ...

  4. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threa­ded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.

  5. George Sweigert - Wikipedia

    en.wikipedia.org/wiki/George_Sweigert

    George H. Sweigert (1920–1999) is credited as the first inventor to patent the cordless telephone. [1]Born in Akron, Ohio, Sweigert served five years in the US Army as a radio operator in World War II in Guadalcanal, Bougainville, Fiji and New Georgia assigned to the 145th Headquarters Company under the 37th Infantry Division (United States).

  6. Cordless - Wikipedia

    en.wikipedia.org/wiki/Cordless

    Cordless phone. The term cordless is generally used to refer to electrical or electronic devices that are powered by a battery or battery pack and can operate without a power cord or cable attached to an electrical outlet to provide mains power, allowing greater mobility. [1]

  7. List of battery types - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_types

    This list is a summary of notable electric battery types composed of one or more electrochemical cells. Three lists are provided in the table. Three lists are provided in the table. The primary (non-rechargeable) and secondary (rechargeable) cell lists are lists of battery chemistry.