Aeon Labs Doorbell supports playing MP3 music files with a press of this doorbell. It has a 128MB flash memory that can store up to 800 ringtones. The volume can be adjusted manually via short press on the Volume Button, also you can switch the doorbell sound to the next via long press on the Volume Button. You may change/update your doorbell ringtone at any point in time you want by connecting your Doorbell to your PC to update the sound track on your Doorbell’s flash memory. There is a small Wireless Button, which can trigger the doorbell on the other side of the wall to play the selected doorbell music when pressed. It also act as a repeater that forward Z-Wave command messages to destination nodes if the originating controller is out of range from the destination node. By taking advantage of the Z-Wave mesh network, commands can be routed to their destination via intermediary “listening” Z-Wave products. Products that are Z-Wave certified can be used and communicate with other Z-Wave certified devices. Also a tool that can be programmed, scheduled, controlled and communicated with from anywhere in the world.