2 chargers are for sale
Item Description:
ATTN: The battery charger set only works for 3.7 V Male JST Charging  connector RC Drone/Quadcopter/Helicopter/Car/Boat
Seller highly recommends, multi-functional Battery Charger. 
Package Including 1PC  charger
Specification: Input 5V   Output:3.7V 500mA
Connector: Female JST Plug (works for Male JST Charging Connector)
This battery charger can be used on all 3.7 V Male JST plug Li-Po battery RC helicopters/ drone/quad copters. Such as:
Syma: S032 S032G  X1
UDI:  U818A U817A U815A
DFD: F161 F163
WLtoys: V686 V686G V959 V969 V979 V989 V999 V929 V949 V212
Double Horse: 9051 9074
Viefly:  V388 VG555 702
EgoFly: LT-712