MFI certified - they don't get much cheaper.
Add on item so maybe useful if your buying over £20
Apple MFi Certified - Apple certified for eqbit Ensure 100% compatibility with any Lightning device.
Perfect Compatibility - Works with Apple iPhone 6 / 6s /6 Plus /6s Plus/ 5 / 5C / 5S, iPad Air,iPad Air 2, iPad Pro, iPad mini, iPod Nano 7th Generation. 3.28feet(1.0 meter). 100% compatible, no warning message.
Superior Quality - Designed to fit into virtually all cases, enjoy lightning-fast data transfer, syncing, and charging
Outstanding Durability - Original 8 Pin connector with a 4200+ bend lifespan, Reversible design, Ultra compact, light-weight and easily coiled
A Cable You Can Count On - Sync and charge with speed. Whether you need to transfer data or charge the battery