{"product_id":"fk-irons-one-update","title":"FK Irons ONE Update","description":"\u003ch3\u003eEngineered for consistency. Refined for precision.\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eFK Irons ONE Update\u003c\/strong\u003e advances the simplicity and dependable power of the original ONE platform with critical performance and ergonomic upgrades. Designed, engineered, and manufactured in the USA, this accessible, wireless pen machine now delivers complete digital visibility and flexible power cell compatibility—keeping your focus entirely on the session.\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2992\/8224\/files\/EMFK-ONE2_ban_cont_600x600.jpg?v=1792698114\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003ch3\u003eKey Upgrades Over the Original ONE\u003c\/h3\u003e\n\u003cp style=\"padding-left: 40px;\"\u003e\u003cstrong\u003e✯ Digital LCD Display:\u003c\/strong\u003e Replaces the original color-spectrum LED with a crisp 1.1\" screen showing real-time voltage, frequency (80–180 Hz), and battery life.\u003c\/p\u003e\n\u003cp style=\"padding-left: 40px;\"\u003e\u003cstrong\u003e✯ 0.2V Fine-Tuned Stepping:\u003c\/strong\u003e Adjust voltage from 5.0V to 12.0V in precise 0.2V increments (compared to 0.5V jumps on the original).\u003c\/p\u003e\n\u003cp style=\"padding-left: 40px;\"\u003e\u003cstrong\u003e✯ Dual-Battery Versatility:\u003c\/strong\u003e Ships with interchangeable short and extended caps to support standard 18500A cells or high-capacity 18650GA cells (3300 mAh) for up to 6.5+ hours of continuous runtime per charge.\u003c\/p\u003e\n\u003cp style=\"padding-left: 40px;\"\u003e\u003cstrong\u003e✯ Enhanced Grip Compatibility:\u003c\/strong\u003e Re-profiled front collar ensures a seamless, flush seal with FK Irons disposable Ergo Shield grips.\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2992\/8224\/files\/OneUpdatePDP071000x1000_png_480x480.jpg?v=1792698024\" alt=\"\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003ch3\u003eDirect Comparison\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"width: 100%; height: 294px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 18.5%; height: 19.6px;\"\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 19.6px; text-align: center;\"\u003e\n\u003ca href=\"\/products\/fkirons-one\" title=\"FK Irons ONE\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2992\/8224\/files\/EMFK-ONE_main_160x160.jpg?v=1721337791\" alt=\"\" style=\"margin-bottom: 16px; float: none; display: block; margin-left: auto; margin-right: auto;\"\u003e\n\u003cstrong\u003eOriginal \u003cbr\u003eFK Irons ONE\u003c\/strong\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 19.6px; text-align: center;\"\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2992\/8224\/files\/EMFK-ONE2_main_copy_1ff05def-b2ea-41bb-b863-c56998ce07d7_160x160.jpg?v=1792698914\" alt=\"\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cstrong\u003eFK Irons \u003cbr\u003eONE Update\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 18.5%; height: 39.2px;\"\u003e\u003cstrong\u003eDisplay Interface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003eBasic color-coded LED spectrum with minimal readout\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003e 1.1\" Digital LCD screen showing voltage, hertz (80–180 Hz), and battery levels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 18.5%; height: 39.2px;\"\u003e\u003cstrong\u003eVoltage Adjustment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003eWider increments of \u003cstrong\u003e0.5 V\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003eFine-tuned increments of \u003cstrong\u003e0.2 V\u003c\/strong\u003e (5.0 V – 12.0 V range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 58.8px;\"\u003e\n\u003ctd style=\"width: 18.5%; height: 58.8px;\"\u003e\u003cstrong\u003eBattery Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 58.8px;\"\u003eDual Panasonic \u003cstrong\u003e18500A \u003c\/strong\u003ecells only (approx. 2000 mAh each)\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 58.8px;\"\u003e\n\u003cstrong\u003eDual-battery format\u003c\/strong\u003e: Supports both \u003cstrong\u003e18500A \u003c\/strong\u003e(short cap) and high-capacity \u003cstrong\u003e18650GA \u003c\/strong\u003ecells (long cap, 3300 mAh)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 18.5%; height: 39.2px;\"\u003e\u003cstrong\u003eMax Runtime\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003e~5 hours per cell (~10 hours total swap)\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003eUp to \u003cstrong\u003e5.5 hours \u003c\/strong\u003e(18500A) \/ \u003cstrong\u003e6.5 hours\u003c\/strong\u003e (18650GA) per cell (~12 hours total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 18.5%; height: 39.2px;\"\u003e\u003cstrong\u003eWeight \u0026amp; Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003eFixed ~227 g; ~124 mm length\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003e\n\u003cstrong\u003e215 g \/ 126 mm \u003c\/strong\u003e(with 18500A) or \u003cstrong\u003e233 g\u003c\/strong\u003e \u003cstrong\u003e\/\u003c\/strong\u003e \u003cstrong\u003e134 mm \u003c\/strong\u003e(with 18650GA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 18.5%; height: 39.2px;\"\u003e\u003cstrong\u003eGrip System\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003eStandard FK modular click grips\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 39.2px;\"\u003eStandard modular grips + optimized integration for \u003cstrong\u003eErgo Shield \u003c\/strong\u003edisposable grips\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 18.5%; height: 19.6px;\"\u003e\u003cstrong\u003eCharger Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 19.6px;\"\u003eStandard dual-bay USB dock\u003c\/td\u003e\n\u003ctd style=\"width: 40.5%; height: 19.6px;\"\u003e\n\u003cstrong\u003eeFest Slim K2 \u003c\/strong\u003edual-slot smart charger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003e\u003cspan style=\"color: #cc0000;\"\u003eThis item includes free standard shipping within the contiguous United States.\u003c\/span\u003e\u003c\/h4\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eStroke Options:\u003c\/strong\u003e 3.0 mm or 4.0 mm\u003cbr\u003e\u003cstrong\u003eVoltage Range:\u003c\/strong\u003e 5.0V – 12.0V (0.2V increments)\u003cbr\u003e\u003cstrong\u003eOperating Frequency:\u003c\/strong\u003e 80 Hz – 180 Hz\u003cbr\u003e\u003cstrong\u003eDimensions: \u003cbr\u003e      \u003c\/strong\u003e- with 18500A battery: 126 mm x 38 mm\u003cbr\u003e      - with 18650GA battery: 134 mm x 38 mm\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e \u003cbr\u003e      - with 18500A battery: 215 g (7.59 oz)\u003cbr\u003e      - with 18650GA battery: 233 g (8.22 oz)\u003cbr\u003e\u003cstrong\u003eNeedle Adjustment:\u003c\/strong\u003e Click-grip ratchet depth adjustment\u003cbr\u003e\u003cstrong\u003eCartridge Compatibility:\u003c\/strong\u003e Standard universal membrane cartridges\u003cbr\u003e\u003cstrong\u003eManual\u003c\/strong\u003e: \u003cstrong\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2992\/8224\/files\/ONE_Update_Int_manual_2026.pdf?v=1792694709\" title=\"FK Irons ONE Update Manual\"\u003eFK Irons One Update\u003c\/a\u003e\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eWhat’s in the Box\u003c\/h3\u003e\n\u003cp\u003e1x FK Irons ONE Update Machine\u003cbr\u003e1x Standard Battery Cap (for 18500A)\u003cbr\u003e1x Extended Battery Cap (for 18650GA)\u003cbr\u003e2x Rechargeable Panasonic Batteries (18500A \u0026amp; 18650GA)\u003cbr\u003e1x Dual-Slot Smart Battery Charger and cable\u003cbr\u003e1x Custom Protective Travel Case\u003cbr\u003eSpare O-Rings\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e* All sales are final for this item. Warranty service for this item provided directly by the manufacturer.\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"FK Irons","offers":[{"title":"Stealth \/ 3.0 mm","offer_id":68227974529247,"sku":"EMFK-ONE2-30K","price":625.0,"currency_code":"USD","in_stock":true},{"title":"Stealth \/ 4.0 mm","offer_id":68251765047519,"sku":"EMFK-ONE2-40K","price":625.0,"currency_code":"USD","in_stock":true},{"title":"Gunmetal \/ 3.0 mm","offer_id":68227974562015,"sku":"EMFK-ONE2-30S","price":625.0,"currency_code":"USD","in_stock":true},{"title":"Gunmetal \/ 4.0 mm","offer_id":68251765080287,"sku":"EMFK-ONE2-40S","price":625.0,"currency_code":"USD","in_stock":true},{"title":"Pop Pink \/ 3.0 mm","offer_id":68227974594783,"sku":"EMFK-ONE2-30N","price":625.0,"currency_code":"USD","in_stock":true},{"title":"Pop Pink \/ 4.0 mm","offer_id":68251765113055,"sku":"EMFK-ONE2-40N","price":625.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2992\/8224\/files\/EMFK-ONE2_main.jpg?v=1792698023","url":"https:\/\/theneedleparlor.com\/products\/fk-irons-one-update","provider":"The Needle Parlor","version":"1.0","type":"link"}