uxcell 1 Set RC-33B NC+NO Magnetic Window Door Contact Alarm Reed Switch Recessed Net Weight: 10g; Package Content: 1 Set x Door Magnetic Reed Switch Size: 11 x 18mm/0.4" x 0.7"(D*H); Product Name: Door Magnetic Reed Switch Color: White; Material: Plastic,Metal Wire Length: 25cm/1"; Type: NC+NO Mounting Type: Recessed; Model: RC-33B