Routers with only Wireless B are no longer manufactured. However, some newer routers still support wireless B. So, it’s still important that you have some basic information about it. Wireless B supports a maximum theoretical transfer rate of 11mbps. The signal is good for up to about 150 feet. A downside to a Wireless B device is that it operates at the unregulated 2.4GHz frequency range. This is the same as many common household appliances. Things like cordless phones and microwaves can cause interference if your router is near these appliances. If you don’t place your router or computer near one of these appliances, you should be fine.