https://amzn.asia/d/cDGcVfp I've been using it for about a month. I haven't had any problems with it. [3-Level Temperature Adjustment, Heats Up Instantly in 3 Seconds] There are three temperature settings: low, medium, and high, which can be easily adjusted. Level 1 [approx. 40-45°C], Level 2 [approx. 50-55°C], Level 3 [approx. 60-65°C]. [3M Insulation, High-Performance Waterproofing, Sealed Structure] Unlike conventional waterproof materials, it uses high-performance waterproof materials.