Specifications: Full charge voltage: 4.2V Working voltage/current: 5V1A, 5V2A, 5V3A Total power: 15W Working status: Both lights are always on Charging completed: Blue light is off 301 charger Size: 15.92mm*34.44mm Package Size: 89.84mm*58.88mm Notes: 1. The full charge voltage of 4.2V will not be fully charged in the high voltage battery. It is recommended to use the yellow dog standard voltage battery. 2. It is recommended to charge a single battery. The voltage difference between the two batteries needs to be less than 0.5V when charging two batteries in parallel. 3. The charging power of 15W is the theoretical power. Features: -Supports direct input from most mobile phone chargers with fast charging protocols. -Supports charging of 2 301 batteries (two in parallel). Recommended Battery: DOGCOM Standard Voltage 1-4V 2S 150C 560mAh RC Lipo Battery Package included: 1x 301 Parallel Portable Charger