Why is this called a femto cell? The area covered is much more than 10^-15 of that of a standard cell tower. If this device covers a radius of 50 ft, and a tower works to a radius of about mile, then the fractional area covered is 10^-4, or somewhere between a microcell and a millicell.
"Hey Ivan, check your six." -- Sidewinder missile jacket patch, showing a Sidewinder driving up the tail of a Russian Su-27