The range of Clifford 2-way car alarms has many features such as remote engine start and remote headlight activation, together with dual zone sensors that give a warning when someone approaches the vehicle before a break-in is attempted, and a digital tilt sensor that senses the vehicle being jacked up or lifted.

Viper 480XV Two Way Car Alarm/Pager Responder Alarms from Viper are simply the most advanced 2-Way Security systems in the world! The interactive display on the Responder remote confirms all commands - virtually instantly - with easy to understand icons, plus text! It alerts users to security system triggers by beeping or vibrating when out of audible range of the siren. Marksman M5A 2-Way Upgrade 2-way transceiver system increases range up to 1,500 ft, Vehicle to transmitter paging capability, 2-way transmitter monitors and reports the following alarm and vehicle conditions, Armed or disarmed status, Alarm triggered status, Reports which sensor triggered the alarm, Reports if the alarm is in valet mode.