Features: 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 content: 5 x 0.9V-5V to 5V DC-DC Booster Module USB Mobile Step-up Power Supply Module