?Warranty?As a Professional Notebook Power Supplier, Our 127w surface book charger are in Compliance with Top Industry Standards, Include Numerous Safety Mechanisms,we Offer an Industry-Leading Return and Exchange Policy: Within 30 Days of Purchase(don't worry about the return window close).. Additionally, LIFETIME service from The Date of Purchase. ?Safety & Durability?127w surface book chargers has a built-in heat dissipation system to protect the charger from overheating at full power output. The built-in IC chip technology provides overload/short-circuit /overheat protection. all surface charger made of premium thicker copper wire and tested with over 20000+ times bend to ensure the durability. ?127W Surface Book Charger Specification?Input: AC 100-240V, Output: 15V 8A 127W. USB Port: 5V 1A USB,10ft power cord cable,The surface laptop charger also work with 102W(15V 6.33A), 65W(15V-4A), 44W(15V-2.58A), 36W(12V-2.58A) and 24W(15V-1.6A). ?Compatible with Surface Book Charger?Surface 127W Power Supply Compatible with Microsoft Surface Book 1/2/3, Surface Laptop 1/2/3,Surface Laptop Studio, Windows Surface Pro 9, 8, 7+, 7, 6, 5, 4, 3, X, Surface Go 3, 2, 1, Surface Laptop Go, iPhone, iPad, Samsung Galaxy, Google Pixel... ?Fast Charging Surface Book 3 Charger?127W Power supply recharge your surface device quickly,come with a USB port that you can simultaneous charging Surface device and cellphone.