... time, use a cr2032 button battery, continuous use of more than 300 hours; machine has been loaded a. , And comes ... can be used for mobile phone chain, handbag Gualian and other trinkets of life to use, compact, beautiful and stylish, ... it is the family, schools, dormitories, restaurants, restaurants, offices and other places of necessity, is walking, dating, camping, mountain climbing, sleep, rest ...