Features: 100% brand new and high quality Input voltage range: 5~6V; output voltage: 4.2V; charging current: 1A. When the charging current drops to 100mA after reaching the final float voltage, the charging cycle will be automatically terminated. When the battery voltage drops below 4.05V (roughly corresponding to 80% to 90% of the battery capacity), the charging cycle restarts. When the battery voltage is lower than 2.9V, the battery will be precharged with a current of 100mA. Applicable occasions: The battery charging board is suitable for charging single lithium batteries or multiple parallel lithium batteries. The charging port can be powered by USB, which is convenient for your operation. Notice: please note that the charge should disconnect the load OUT terminal on the positive and negative can not be wrong, please according to specifications, otherwise it will break directly; The ammeter for testing current can only be connected in series with the 5V input terminal of the charging board. The package includes: 1x Lithium Battery Charger Module. Package Includes: 1x Charger Module Specifications: Material: ABS Input Voltage Range: 5~6V Output Voltage: 4.2V Charging Current: 1A Size: Approx. 12.515.5mm/0.49x0.61inch note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.