Two operating modes (addressable for Digiplex EVO series or conventional relay operation) Remote test mode when used with Test Trek V2 Full audio and infrasound spectrum analysis 7-band digital filter, digital amplifier gain and frequency fluctuation evaluation Impact and shock wave analysis High immunity to RFI and EMI signals Adjustable sensitivity: covers up to 9 m (30 ft) when set high and 4.5 m (15 ft) when set low TestTrek (459), used for testing, available separately Anti-jamming switch