BL900HW is the service gateway device to provide the KDDI's FTTH service.
So this can be used only in KDDI's network.

This also has the following features
・Wireless router technology : IEEE 802.11a/b/g/n dual band.
・Number of USB Ports：USB2.0 × 1 port
・Number of Ether port : 1Gbps × 4port type RJ45
・Dial-up port ：1port type RJ11

When you use this device as the z-wave gateway, you have to subscribe the KDDI's FTTH service and plug the special dongle provided by KDDI to USB port.
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Diference from BL900
1. Change of Product appearance
2. Change of Model Number and Product name
3. VDSL Modem type
These changes does not affect Z-Wave behavior and functionality at all.