\-s serial | --serial serial
This selects a ChaosKey by serial number instead of using the first
one found.
+.TP
+\-l length | --length length
+Set the amount of data to read. Suffixes 'k', 'M' and 'G' are
+supported. The default is 1k.
.SH USAGE
.I ao-chaosread
reads noise data.