Gikfun Reed switch open Magnetic Induction Switch for Arduino (Pack of 10pcs) EK1621 10pcs Reed switch MagSwitch 2 * 14mm Normally open Magnetic induction switch Glass Length: 14mm/ 0.55inches Glass Diameter: 2mm/ 0.079inches Total Length: 45mm/ 1.77inches Max Switching Voltage: 300 VDC Min Breakdown Voltage: 150 VDC Max Contact Rating: 10W Max Switching Current: 0.55 A