18CLASSIC: 1-WAY ALARM SYSTEM What better way to secure your car from theft than with DS18's new 1-Way Alarm System Highlights Two - 4 Button Long Distance Transmitters 6 Tones 125dB Siren Shock Sensor with Sensitivity Adjustment Window rolls up automatically (optional) Remote Trunk Releasing Parking Light Flash Engine Cut Off Panic Function Specifications Working Voltage: 9-15v Working Frequency: 433.92 MHz ± 400KHz Remote Control Distance: ≥100 Meter Receiving Sensitivity: ≤-98dB Working Tempe