Input: 100-240V 50-60 Hz, Output : 16.5V 3.65A;Note:This is the first generation of magsafe power adapter(L-Shape), not the second generation. Suitable for MacBook Pro (before 2012) model: A1344, A1330, A1342, A1278, A1185, A1184, A1181. NOTE: To use these steps correctly, first connect the L-Tip connector to your Macbook then plug in the charger to power it. Protective function: replacement chargers manufactured with the highest quality materials and include multiple smart features safeguarding against IV - incorrect voltage, SC - short circuit, IO - Internal overheating. Ce/FCC/RoHS certified.