Low voltage bell wire with insulated solid conductors resistant to spread of fire. Used in thermostats, burglar alarms, and intercoms. 300-volt rating in 500-foot spool. UL (Underwriter's Laboratories) listed. 20-2, red/white. This wire is flexible, allowing for easy installation in tight spaces, and is designed to provide reliable, low-resistance performance for, signaling, and, communication needs. . It features two solid, bare copper conductors (red and white) twisted together, commonly used for doorbells, thermostats, security systems, and intercoms.