The Ditek DTK-2MHLP-24B is a voice, data, and signaling circuit modular surge protector.Backed by a ten year limited warranty, the 2MHLP-24B has a service voltage of 24 volts and is designed to protect two circuit pairs per module. Ideal for protecting current loops and burglar alarm panels, this surge protector works on AC and DC circuits. Also known as -Ditek 24V 2PR HYBRD FIELD REPL MOD - DK-2MHLP24B