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  2. Invisible Fence Inc. - Wikipedia

    en.wikipedia.org/wiki/Invisible_Fence_Inc.

    Invisible Fence Inc. (commonly referred to as Invisible Fence Brand) is a company that designs radio pet fences for cats and dogs. Manufactured and distributed by Radio System Corporation, the company sells wireless and fenceless systems that were first introduced in 1973. [1]

  3. Pet fence - Wikipedia

    en.wikipedia.org/wiki/Pet_fence

    Other pet fences are wireless. Rather than using an underground wire, they emit a radio signal from a central unit, and activate when the pet travels beyond a certain radius from the unit. In another type, the collar uses GPS signals to determine proximity to a predetermined "virtual fence", without the need for any physical installation at all.

  4. Flipper Zero - Wikipedia

    en.wikipedia.org/wiki/Flipper_Zero

    Flipper Zero is designed for interaction with various types of access control systems, radio protocols, RFID, near-field communication (), and infrared signals. [6] [7] To operate the device, a computer or a smartphone is not required; it can be controlled via a 5-position D-pad and a separate back button.

  5. Free Fire (video game) - Wikipedia

    en.wikipedia.org/wiki/Free_Fire_(video_game)

    Free Fire Max is an enhanced version of Free Fire that was released in 2021. [ 71 ] [ 72 ] It features improved High-Definition graphics , sound effects , and a 360-degree rotatable lobby. Players can use the same account to play both Free Fire Max and Free Fire , and in-game purchases, costumes, and items are synced between the two games. [ 73 ]

  6. Rechargeable battery - Wikipedia

    en.wikipedia.org/wiki/Rechargeable_battery

    A rechargeable battery is only one of several types of rechargeable energy storage systems. [46] Several alternatives to rechargeable batteries exist or are under development. For uses such as portable radios , rechargeable batteries may be replaced by clockwork mechanisms which are wound up by hand, driving dynamos , although this system may ...

  7. Free Fire World Series - Wikipedia

    en.wikipedia.org/wiki/Free_Fire_World_Series

    Free Fire World Series 2020 had to be replaced with Free Fire Continental Series 2020 which was held to be on April 19. Free Fire Continental Series was held as 3 separate events for Asia, EMEA and Americas. The event was streamed live on YouTube and had 1.5 million peak live viewers. There was a prize pool of $300,000.

  8. Rechargeable alkaline battery - Wikipedia

    en.wikipedia.org/wiki/Rechargeable_alkaline_battery

    The first generation rechargeable alkaline batteries were introduced by Union Carbide and Mallory in the early 1970s. [3] [5] Several patents were introduced after Union Carbide's product discontinuation and eventually, in 1986, Battery Technologies Inc of Canada was founded to commercially develop a 2nd generation product based on those patents, under the trademark "RAM".

  9. Lithium polymer battery - Wikipedia

    en.wikipedia.org/wiki/Lithium_polymer_battery

    It was a system like this that Bellcore used to develop an early lithium-polymer cell in 1996, [28] which was called a "plastic" lithium-ion cell (PLiON) and subsequently commercialised in 1999. [27] A solid polymer electrolyte (SPE) is a solvent-free salt solution in a polymer medium.