... security 2.Zinc alloy material,fadeless,durable 3.Wireless lock system 1.Electronic lock characterSuitable for hotel ,apartment,office,residential door ... 4pices AA alkaline batteries,at least one year battery life,low voltage alarm level at 4.8V or less;Match a set ... unlocking card it can be customised according to your management system completely. 2.Mortise with measurement3.Panel measurement of lock4 ...