With a wireless charger that delivers 15 watts of power, you can charge your iPhone or Samsung smartphone very quickly. Each smartphone brand uses its own fast charging technology that only works for devices of that brand. Do you have an iPhone that supports 15-watt charging, such as the iPhone 12 series? You can only charge it at maximum speed with an Apple MagSafe Wireless Charger 15W. For the Samsung S and Note series from the S20/Note 20, you use a Samsung wireless fast charger of 15 watts. There are also 15-watt chargers from other brands, but they only deliver the maximum speed to devices that aren't available in the Netherlands. They do work with Apple and Samsung, but they're slower than the 15-watt chargers by Apple and Samsung.