【COMPLETE UPGRADED FEATURE SET】Cordless automatic yarn winder with a built-in 3600mAh rechargeable battery, Type-C charging, up to 10 hours of continuous runtime, 15oz large capacity, stepless speed control, upgraded motor, dual-spring double tension, low-noise operation, 2 yarn ball tubes, anti-slip silicone rings, neat tangle-free winding, compatibility with yarn weight 5 and below, plus a 1-year warranty. 【3600mAh BATTERY & 10-HOUR RUNTIME】Unlike a corded electrical yarn winder, this rechargeable yarn winder electric model lets you wind yarn wherever you work. The built-in battery provides up to 10 hours of continuous operation, while conv