DESC: This car charger is compatible with the following Siemens models:C61, CT66.S55, S66.SX1.It is not like other cigarette adaptors, it has the overload prevention circuit to protect your cell phone. Our intelligent rapid charger plugs into your car's cigarette lighter. Great for travelers on-the-go to recharge your weak or dead cellular phone batteries. Get one for each car. Never be caught with a dead battery with your cellular phone again! Specifications:Universal Vehicle Lighter Adaptor (12~24volt DC).Charge your phone quickly without overcharging when you are on the go.Short circuit protection.Suitable for all Ni-Mh, Ni-cd and Li-Ion Battery.Charge and talk at the same time.LED charging indicator.