Winomo Premium Recessed Security Magnetic Door Window Contact Reed Switch - 5 Piece Color: mainly white. Material: Plastic. Range: 15-25mm. Current: 0.5 A. Voltage: 100V. Power: 10W. Cable Length: Approx 9 inch. Switch size ( x H): Ca. 10 x 33 mm. Designed to do embedded in door or window frame in door or window frames. Normally closed: When the solenoid is closed in the vicinity of the switch in the normal position, opens the loop, and if the magnet is removed, the loop is pulled closed.