I have had this remote start alarm for four years, & i have been very happy with it. 2way remote battery life is outstanding. Remote start range is ok for the fact that i bought the unit for 108+ tax. The shock sensor is very good on this alarm keeping in mind that the 2way remote warns you of any impact on the car. Also the user can change alot of settings of the alarm right from the the 2way remote. Keep in mind that u still have a one way remote. I would buy another one of Scytek Astra 2way remote start alarms any day.