What voltage and wattage does my dell inspiron N7110 charger use?

My charger broke and I need a new one! I don't know how you check the voltage and wattage and I don't want the wrong one. And does it even matter? Because when I was on Amazon people kept complaining about the wrong voltage and wattage. And if you can't tell me what it is, can you tell me where to find the voltage and wattage? Thanks!