Spotlight Gadget: USB Knee WarmersBy Staff editor / March 22, 2007 / Spotlight Gadgets / Leave a Comment If you buy something from a link in this article, we may earn a commission. Learn more You’ve seen the USB warming gloves and the USB warming slippers. The next body parts up for warming are your knees! SHARE ON TwitterFacebookPin It ESR for MagSafe Wallet, 5-Card Holder, Magnetic Wallet for iPhone, RFID Blocking, with 3,200 g Magnetic Strength, Vegan Leather, Slim for iPhone 16/15/14/13/12 Series, Not for 13/12 Mini, Black Available for Amazon Prime 35% Off $19.99 $12.99 (as of May 29, 2025 04:59 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.) for MagSafe Wallet, Strongest Magnetic Wallet for iPhone 16/15/14/13/12 Series, 7 Cards Holder, Magnetic Phone Wallet, Leather Minimalist Slim RFID for iPhone Wallet, 1 Slot, Black & Black Available for Amazon Prime $19.99 (as of May 29, 2025 05:01 GMT -04:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)