Spider Security's "DST-1K2K-RESPK" is designed by a seasoned installer with over 20 years of experience. This product eliminates commonly-made field wiring mistakes installing door contact sensors! Save time and money NOW!!! (This product is compatible with many major access control systems that require 1,000/2,000 ohm or 1,000/500 ohm resistor monitoring configurations. This includes but is not limited to systems: Software House, GE, Lenel, S2, AMAG and much more!) Our customers save thousands of dollars annually...By turbo-charging install times and eliminating troubleshooting! Package includes: (Qty 10) and (1) Installation Manual "In-Line Capsule" design contains (Qty 2) 1,000 Ohm Resistors rated at 1/4W Pre-twisted wires allows for easy insertion & removal Lifetime Warranty: Just mail the bad units to us with your return address!