The MVP D-TEK® Multi-Voltage Vehicle Detector w/harness 9-240 AC/DC Multi Voltage Power detector Benefits include: Universal voltage Operates in both fail safe and fail secure modes Reliability Features Covers all the voltages Operates in both fail safe and fail secure modes Enhanced Lightning/Surge immunity Aluminum RF shield housing Built-in loop conditioner Loop isolation transformer Loop diagnostics Frequency counter Gold plated control contacts 2 relays (presence & pulse or presence)