No warranty card is required, Product serial number is enough for claiming warranty.
In case Product package is opened, we will not accept the return of the product.
You should claim warranty in case you face any trouble.
High capacity of 20000mAh
Holds more charges, eg. 4.8 charges for iPhone XS
2.1A Turbo Recharge could reach full capacity with much less time
Li-polymer battery greatly improves safety
The charger and your devices could be charged simultaneously