Scytek astra777 Scytek Astra777 2 Way Lcd Pager Car Security System Astra 777 2-way LCD Pager Car Security System and Keyless Entry Security System Built-In Parking-Light Relay Plug-in user programmable Coded Override Switch Plug-in Dual-Zone Dual Adjust Piezo Sensor Remote Door Locking/Unlocking negative outputs