Anker 20W USB C PD Charger (Nano Pro) - £5.99 with voucher, sold by Anker Direct @ Amazon

Looks like a great price for a small 20W USB C PD charger from a reliable and reputable brand. Good match for iPhone/iPads and plus most other phones with a USB C socket.

Previous price charts on keepa don't seem to show this as having been as cheap as this before at £11.99 Prime + £6 off voucher until 18th December = £5.99.

Note that there's no cable supplied, so you'll need a suitable lead if you haven't got one such as a USB C to Lightning cable for iPhones or a USB C to USB C PD cable for everything else.

EDIT: If you want to use it with an iPhone don't have a USB C to Lightning cable already then this deal for an Anker charger with cable included for £8.44 is a better deal!

EDIT 2: Only Powdered Pink is available now, link updated to reflect change.

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From the manufacturer-

Model Number: A2637 / Anker 511 Charger (Nano Pro) / Faster. Smarter. Safer.

Charge iPhones Faster

• A 20W output is designed to charge the iPhone 13 series up to 3× faster than with an original 5W charger.

ActiveShield Safety System

• Provides continuous temperature monitoring and output control to protect your connected device.
• Charge in Style
• Anker Nano Pro has an eye-catching icy finish and comes in 4 unique colors: Arctic White, Black Ice, Glacier Blue, and Cool Lavender.

Small Size, Big Power

• Roughly the same size as an original 5W charger—but way more powerful.

Compatibility

• iPhone 13 / 13 Mini / 13 Pro / 13 Pro Max / 12 / 12 mini / 12 Pro / 12 Pro Max / iPhone SE (2nd generation) / 11 / 11 Pro / 11 Pro Max / XS / XS Max / XR / X / 8 Plus / 8;
• iPad 10.2-inch / iPad mini 8.3-inch / iPad Pro 12.9-inch 4th / 3rd / 2nd / 1st generation; iPad Pro 11-inch 2nd / 1st generation; iPad Pro 10.5-inch; iPad Air 4th / 3rd generation; iPad 8th / 7th generation; iPad mini 5th generation, AirPods, Apple Watch
• Galaxy Z Flip; S10+ / S10 / S10e
• Pixel 3 / 3XL / 4 / 4XL / 5, and More

UK Specs

• Input : 200-240V 0.6A 50Hz
• Output: 5.0V==3.0A / 9.0V==2.22A 20W
• Dimensions: 49.7 × 43.4 × 21.5 mm

Notes

• Charges Nintendo Switch but does not support "Charge-and-Play" in TV mode.
• After connecting to iPhone (8 / 8 Plus / X / XS Max / XS / XR), fast charging (9V) will begin automatically, regardless of whether you hear one charging indicator sound or two.
• This charger does not support Samsung Super Fast Charging for Galaxy S20, S21, Note 10/10+/20/20 Ultra.
• Use a USB-C to Lightning cable for Lightning devices and use a USB-C to USB-C cable for USB-C devices such as the Samsung (Cables sold separately).
• Due to the safety requirements of lithium batteries, charging speeds for phones will be faster from 0% to 50% capacity than from 50% to 100%