The MG2213 are the keys used to unlock the faceplate of item M21A- 3G/5G. The MG2213 is included with each sensor and can be purchased separately. Please contact a Mouser Technical Sales Representative for further information. Sensors 110-M21A-3G-VV 110-M21A-3G-VH 110-M21A-5G-HH 110-M21A-5G-VH 110-M21A-5G-VV Key 110-MG2213 5-0523-2