Detailed Product Description Patent No. Z L 2006 20002257.1 Issuing date 2007/2/28 *Good for outdoor exercise *Your fingers will not be freezing *High tech li-ion rechargeable battery 7*5*2cm, 44 gram, (for adults glove) 3*6*2cm, 28 gram, (for kids glove) Standard:2000mAh, 3.7V *Heat system with carbon material *220V, AC charger:12V, DC charger.