The Apple Power Adapter Extension Cable. This AC extension cord provides an extra 5.9' for your Apple power supply and allows the bulky transformer to rest on a flat surface instead of hanging from the outlet. It features a grounded three-prong North American plug and is compatible with MagSafe and MagSafe 2 power adapters, 10W and 12W USB-A power adapters, and 29W, 30W, 61W, 87W, 96W, or 140W USB-C power adapters.