YouCute 1to3 Charger for UDI U818S U842 U842-1 UDI 001 002 902 Lark FPV Rc Quadcopter Drone Spare Parts Package include : 1to3 charger For Udi U818S U842 U842-1 RC drone For Udi 001 002 902 RC boat Charging 3 batteries at one time.Over charge protection, Short circuit protection,safety in use Light on when charging......Light off when charge complete