Smart batteries and smart charger : – 1 pc 14s 28000 mAh smart batteries:They have inner intelligent voltage manage system, to show remaining voltage and cycles use in app. Waterproof IP 53. They have over current protection circuit and temperature shutdown circuit. – 1 dual-channel 3000W 6055P smart charger: can quick charge and protect batteries effectively. Two brushless water pumps for 30L drone sprayer. Brushless water pumps can be used for more than 500 hours, which are 3-5 times longer than ordinary water pumps , this is will reduce maintenance cost. Voltage range: 12-14V Max flow: 2 * 5L/min Waterproof: IP 68 After finishing spraying, it can be washed with water directly to reduce pesticide corrosion.