Lithium battery one for five charger

[Product Name]: 3.7V Smart USB Charger
[Product model]: -Drop five charger
[Product input]: DC 5.0V2-2.5A
[Product output]: DC 4.2V 500mA
[Product Size]: Length 40*Width 35*Thickness 13 mm
[Set accessories]: Charger + USB charging cable
[Product Trademark]: HJ
[Applicable type]: Suitable for 3.7V lithium battery charging