Features: 1. Equipped with a built-in 4000mAh high capacity battery, this portable wireless straight hair comb offers long-lasting performance for effortless styling anytime, anywhere. 2. With intelligent four-level temperature control (140°C-160°C-180°C-220°C), this negative ion straight hair comb is suitable for all hair types, providing gentle care for every strand. 3. This cordless hair straightener features an smart charging monitor that displays the charge status in real time, allowing you to easily track progress and ensure a fully charged experience every time you use it. 4. The 3D anti-scald design with heat-insulating comb teeth ensures safe handling during use, allowing for elegant styling without worry. Specifications: Product name：Hair straightening comb Model：HF520 Rated power: 35W Working voltage: 3.7V Operating temperature: four levels (140 ℃-160 ℃-180 ℃-220 ℃) Battery capacity: 4000mAh Charging voltage: 5V-1A Notes: 1. Cannot be used during charging 2. After powering on, it needs to be heated for about 5 minutes to reach 140℃. The indicator light flashes during the heating process. When the specified temperature is reached, the temperature indicator light is always on. Packing List: 1*Wireless Hair Straightening Comb 1*Comb 1*Hair Clip 1*Type-C Charging Cable 1*English Manual