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Lock Durability Description
iButton E2
E2 - Heavy-Duty - for Commercial Use (ANSI Grade 1 Rating)
This is the highest rating available. Locks with this rating are suitable for use on commercial doors that are opened frequently (100+ times/day).
iButton E4
E4 - Medium-Duty to Heavy-Duty - for Residential to Light Commercial Use
Locks with this rating are suitable for use on doors that are opened no more than about 60 times per day, depending on the weight of the door.
iButton E6
E6 - Light-Duty - for Residential Use
Locks with this rating are suitable for use on doors that are opened no more than about 20 to 30 times per day, depending on the weight of the door.