The most powerful battery in the range. This battery with its modern and ergonomic design is known for its performance and efficiency. It produces up to 8 hours of constant and uniform warmth for your feet. It has a drying option for quickly drying insoles after skiing.  Specifications: -3 warming modes for perfect warmth -Dries the insoles - 8-hour battery life -Easy to clip on -Lithium-ion battery -100 - 240 V / 50 - 60 Hz -Universal charger (connector for use in EU/USA/GB)