The Best Inventions of 2021
November 10, 2021 6:15 AM EST

SPECIAL MENTION: Smart dog collars can help you track your pet or see how active they’ve been all day, but most need to be charged after just a couple of days. Not so the Fi Series 2 ($129)— it uses low-power Wi-Fi integration to attain a battery life of up to three months. —Jesse Will

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