Check the listing for details. 5 Recessed Door Window Reed Switch Sensor Contact Normally Open Loop Used w/LED. Condition: New. Listed at 19.00 USD. QTY 5 3/8" Recessed Stubby N/O 18" Wire Leads Switches with magnets Typically used with LEDs light not included. • 3/8" Dia with 18" Long Wire Leads • Easy & Quick installation • Operate Gap ¾" (19mm) min. When the magnet is next to the switch in the normal position, the loop is OPEN. When the magnet is pulled away the loop CLOSES. Reed Switch Specifications Contact Rating : 10W/VA Switching Voltage (Max.) : 200 VDC Switching Current (Max.) : 0.5 Amp. Contact Resistance (Min.) : 150 milli ohms Life Expectancy : 10x 10 6 Operations Insulation Resistance : 10 9 ohms Shock Resistance : 30G for 11mSec. Vibration Resistance : 20G ( 10 to 1000Hz) Check out my other items! Alarm Dealers are Welcome E-mail us with questions before buying