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Included Hardware: (2) 3x20mm screws (1) Double sided adhesive pad The wireless door chime kit has two components: Battery Operated Chime (Receiver) PushButton (Transmitter) Plugs into 120V outlet Battery included Setting The House Security Code Each chime component has 3 jumpers for setting the house security code. In most cases you will not need to change the factory settings for the house security code. If your chime activates intermittently or does not work at all, you may be able to solve t