【MewaMaA - Safer & Longer Battery】TIPS: if you need backup batteries, please search the ASIN:B0CHJX54HC .Compared with others' 5V battery(Actual 3.7V), our 7.4V rechargeable lithium battery provides faster heating speed and better performance at low temperature, and higher energy(7.4V*3000mAh=22.2Wh) brings up to 8 hours warmth(At low level&full charge). In all, our UL,FCC,CE certified battery keeps you warmer and safer. 【Superfine Fibre & 7 layers of Materials】The palm part is made of superfine fibre, non-slip and more wear-resistant than others' PU material, leading to longer service life. 7 layers material ensures enough warmth. Velvet lining is comfortable to wear with performance upgrade. Besides, diving materials in battery insulation pocket ensure stronger temperature-locking effect. 【Warm to fingertips & Power display】Equipped with 30K super-tough double-row heating wire, heating area covers the entire back of hand, from fingers to fingertips. The switch panel is easy to operate, adding the unique battery power display function. Besides, our ergonomic-design heating gloves fit your hands perfectly during sports. 【Touch Screen & Waterproof】The sensitive touch screen function of thumb and index finger allows you to use any electronic devices in cold winter without taking off gloves. In addition, our winter gloves are breathable, waterproof and windproof, keep your hands dry and comfortable during skiing, ice fishing, hiking, cycling and other sports.