Uxcell a14060400ux0170 5pcs Recessed NO Security Alarm Door Window Contact Sensor Magnetic Reed Switch Product Name : Magnetic Door Switch ; Contact Type : NC, Normally Close ; Contact Capacity : 0.5A(Maximum Switch Current) Voltage : 100V ; Rated Power : 10W ; Actuation Distance : 0-15mm Cable Length : 33cm/13" ; Size(Approx) : 2.5 x 2.3cm/ 1" x 0.9"(D*H)