DC - DC booster module (0.9 V to 5 V) 5 V 600 ma USB mobile booster * Input voltage: 0.9V-5V DC * Transfer efficiency:96%(max) * With USB port * With working indicator light * with one AA battery power supply output current can up to 200~300mA, * two AA batteries to the output current of 500~600mA Specifications: * Size:34 x 15 x 7mm * Net weight:4g * Package weight:14g