A:AnswerNo, this charger is only usb-a to usb-c. The S7 uses a micro-usb port. However, you can get a connector that connects the USB-C end to a Micro-usb.
A:AnswerSimple answer is yes, 25W. However, the answer Samsung provided isn't necessarily incorrect. It's a 12 volt charger that pulls 2.1 amps. Volts X amps = watts, so 12V X 2.1A = 25.2W.
Hope this helps!
A:AnswerThanks for your inquiry, Yada. We wouldn't recommend using this charger with a device that doesn't support fast charging as it could lead to overcharging the device or damage to the battery. We also cannot guarantee compatibility between our products and third-party devices. Thank you for your interest and we hope this information is helpful!