The complete HEAT and VIPER 4.0 bridge combo. Thermal on one eye, digital night vision on the other, bridged and ready to run head mounted straight out of the box.Thermal handles detection. It picks up heat signatures through darkness, light brush and weather that defeat the naked eye. Digital night vision handles recognition, giving you the detail and context to identify what the thermal found. Running both at once is why people bridge them. HEAT 4.0 thermal monocular VIPER 4.0 digital night vision monocular Bridge assembly included Runs bridged, head mounted, or each unit handheld Rechargeable and swappable batteries Free G24 helmet mount with every order Covered for 3 months as standard, or up to 12 months with Operator Care.We sell direct. No distributors, no retail markup, no middlemen.