How user friendly is Yale Premium Telecommunicating Alarm?

How-user-friendly-is-Yale-Premium-Telecommunicating-Alarm

  Yale 6400 is a very easy to use and user friendly alarm and can be operated in the following options. 1 When the system is disarmed (alarm off), press the arm key on the Yale 6400 control unit, keypad or keyfob. 2 The control unit will start its countdown. …

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