In order to fast charge a device, both the connected wall charger and the device need to support the same charging technology.

1. Check the charging technology and the maximum wattage the device supports:

• Search on Google.
• The following website shows detailed specifications of most phones and tablets: https://www.gsmarena.com/

2. Choose wall chargers that have the same or higher wattage and charging technology:

For example:

• iPhone 12 supports fast charging 20W through Power Delivery, which makes Anker’s 511 Nano Pro Charger that supports 20W and Power Delivery the recommended choice. 
• Samsung S20 supports super fast charging 25W through the PPS, which makes Anker’s Nano II 30W that supports PPS the recommended choice.
• Samsung Galaxy S8 supports Qualcomm Quck Charge, which makes Anker’s Powerport +1 Quick Charge 3.0 the recommended choice.
• Samsung Galaxy S20 supports super fast charging 25W, with a PPS (Programmable Power Standard) charger, which makes Anker’s Nano II 30W charger the recommended choice.